how to cite a scientific research paper

The CSE Manual for Authors, Editors, and Publishers

• MANUSCRIPT PREPARATION
• MANUSCRIPT AND PROOF MARKUP
• SAMPLE CORRESPONDENCE
• EDITORIAL OFFICE PRACTICES (PDF)
• PROMOTING INTEGRITY IN SCIENTIFIC JOURNAL PUBLICATIONS
• SCIENTIFIC STYLE AND FORMAT CITATION QUICK GUIDE

Scientific Style and Format Citation Quick Guide

Scientific Style and Format presents three systems for referring to references (also known as citations) within the text of a journal article, book, or other scientific publication: 1) citation–sequence; 2) name–year; and 3) citation–name. These abbreviated references are called in-text references. They refer to a list of references at the end of the document.

The system of in-text references that you use will determine the order of references at the end of your document. These end references have essentially the same format in all three systems, except for the placement of the date of publication in the name–year system.

Though Scientific Style and Format now uses citation–sequence for its own references, each system is widely used in scientific publishing. Consult your publisher to determine which system you will need to follow.

Click on the tabs below for more information and to see some common examples of materials cited in each style, including examples of electronic sources. For numerous specific examples, see Chapter 29 of the 8th edition of Scientific Style and Format .

Citation–Sequence and Citation–Name

The following examples illustrate the citation–sequence and citation–name systems. The two systems are identical except for the order of references. In both systems, numbers within the text refer to the end references.

In citation–sequence, the end references are listed in the sequence in which they first appear within the text. For example, if a reference by Smith is the first one mentioned in the text, then the complete reference to the Smith work will be number 1 in the end references. The same number is used for subsequent in-text references to the same document.

In citation–name, the end references are listed alphabetically by author. Multiple works by the same author are listed alphabetically by title. The references are numbered in that sequence, such that a work authored by Adam is number 1, Brown is number 2, and so on. Numbers assigned to the end references are used for the in-text references regardless of the sequence in which they appear in the text of the work. For example, if a work by Zielinski is number 56 in the reference list, each in-text reference to Zielinski will be number 56 also.

List authors in the order in which they appear in the original text, followed by a period. Periods also follow article and journal title and volume or issue information. Separate the date from volume and issue by a semicolon. The location (usually the page range for the article) is preceded by a colon.

Author(s). Article title. Journal title. Date;volume(issue):location.

Journal titles are generally abbreviated according to the List of Title Word Abbreviations maintained by the ISSN International Centre. See Appendix 29.1 in Scientific Style and Format for more information.

For articles with more than 1 author, names are separated by a comma.

Smart N, Fang ZY, Marwick TH. A practical guide to exercise training for heart failure patients. J Card Fail. 2003;9(1):49–58.

For articles with more than 10 authors, list the first 10 followed by “et al.”

Pizzi C, Caraglia M, Cianciulli M, Fabbrocini A, Libroia A, Matano E, Contegiacomo A, Del Prete S, Abbruzzese A, Martignetti A, et al. Low-dose recombinant IL-2 induces psychological changes: monitoring by Minnesota Multiphasic Personality Inventory (MMPI). Anticancer Res. 2002;22(2A):727–732.

Volume with no issue or other subdivision

Laskowski DA. Physical and chemical properties of pyrethroids. Rev Environ Contam Toxicol. 2002;174:49–170.

Volume with issue and supplement

Gardos G, Cole JO, Haskell D, Marby D, Paine SS, Moore P. The natural history of tardive dyskinesia. J Clin Pharmacol. 1988;8(4 Suppl):31S–37S

Volume with supplement but no issue

Heemskerk J, Tobin AJ, Ravina B. From chemical to drug: neurodegeneration drug screening and the ethics of clinical trials. Nat Neurosci. 2002;5 Suppl:1027–1029.

Multiple issue numbers

Ramstrom O, Bunyapaiboonsri T, Lohmann S, Lehn JM. Chemical biology of dynamic combinatorial libraries. Biochim Biophys Acta. 2002;1572(2–3):178–186.

Issue with no volume

Sabatier R. Reorienting health and social services. AIDS STD Health Promot Exch. 1995;(4):1–3.

Separate information about author(s), title, edition, and publication by periods. The basic format is as follows:

Author(s). Title. Edition. Place of publication: publisher; date. Extent. Notes.

Extent can include information about pagination or number of volumes and is considered optional. Notes can include information of interest to the reader, such as language of publication other than English; such notes are optional.

Essential notes provide information about location, such as a URL for online works. See Chapter 29 for more information.

For books with more than 1 author, names are separated by a comma.

Ferrozzi F, Garlaschi G, Bova D. CT of metastases. New York (NY): Springer; 2000.

For books with more than 10 authors, list the first 10 followed by “et al.”

Wenger NK, Sivarajan Froelicher E, Smith LK, Ades PA, Berra K, Blumenthal JA, Certo CME, Dattilo AM, Davis D, DeBusk RF, et al. Cardiac rehabilitation. Rockville (MD): Agency for Health Care Policy and Research (US); 1995.

Organization as author

Advanced Life Support Group. Acute medical emergencies: the practical approach. London (England): BMJ Books; 2001.

Author(s) plus editor(s) or translator(s)

Klarsfeld A, Revah F. The biology of death: origins of mortality. Brady L, translator. Ithaca (NY): Cornell University Press; 2003.

Luzikov VN. Mitochondrial biogenesis and breakdown. Galkin AV, translator; Roodyn DB, editor. New York (NY): Consultants Bureau; 1985.

Chapter or other part of a book, same author(s)

Gawande A. The checklist manifesto: how to get things right. New York (NY): Metropolitan Books; 2010. Chapter 3, The end of the master builder; p. 48–71.

Chapter or other part of a book, different authors

Rapley R. Recombinant DNA and genetic analysis. In: Wilson K, Walker J, editors. Principles and techniques of biochemistry and molecular biology. 7th ed. New York (NY): Cambridge University Press; 2010. p. 195–262.

Multivolume work as a whole

Alkire LG, editor. Periodical title abbreviations. 16th ed. Detroit (MI): Thompson Gale; 2006. 2 vol. Vol. 1, By abbreviation; vol. 2, By title.

Dissertations and Theses

Lutz M. 1903: American nervousness and the economy of cultural change [dissertation]. [Stanford (CA)]: Stanford University; 1989.

Blanco EE, Meade JC, Richards WD, inventors; Ophthalmic Ventures, assignee. Surgical stapling system. United States patent US 4,969,591. 1990 Nov 13.

Weiss R. Study shows problems in cloning people: researchers find replicating primates will be harder than other mammals. Washington Post (Home Ed.). 2003 Apr 11;Sect. A:12 (col. 1).

Indicate a copyright date with a lowercase “c”.

Johnson D, editor. Surgical techniques in orthopaedics: anterior cruciate ligament reconstruction [DVD]. Rosemont (IL): American Academy of Orthopaedic Surgeons; c2002. 1 DVD.

Websites and Other Online Formats

References to websites and other online formats follow the same general principles as for printed references, with the addition of a date of update/revision (if available) along with an access date and a URL.

Title of Homepage. Edition. Place of publication: publisher; date of publication [date updated; date accessed]. Notes.

If no date of publication can be determined, use a copyright date (if available), preceded by “c”. Include the URL in the notes.

APSnet: plant pathology. St Paul (MN): American Phytopathological Association; c1994–2005 [accessed 2005 Jun 20]. http://www.apsnet.org/.

Online journal article

Author(s) of article. Title of article. Title of journal (edition). Date of publication [date updated; date accessed];volume(issue):location. Notes.

A DOI (Digital Object Identifier) may be included in the notes in addition to a URL, if available:

Savage E, Ramsay M, White J, Beard S, Lawson H, Hunjan R, Brown D. Mumps outbreaks across England and Wales in 2004: observational study. BMJ. 2005 [accessed 2005 May 31];330(7500):1119–1120. http://bmj.bmjjournals.com/cgi/reprint/330/7500/1119. doi:10.1136/bmj.330.7500.1119.

Author(s). Title of book. Edition. Place of publication: publisher; date of publication [date updated; date accessed]. Notes.

Brogden KA, Guthmille JM, editors. Polymicrobial diseases. Washington (DC): ASM Press; 2002 [accessed February 28, 2014]. http://www.ncbi.nlm.nih.gov/books/NBK2475/.

Author’s name. Title of post [descriptive word]. Title of blog. Date of publication. [accessed date]. URL.

Fogarty M. Formatting titles on Twitter and Facebook [blog]. Grammar Girl: Quick and Dirty Tips for Better Writing. 2012 Aug 14. [accessed 2012 Oct 19]. http://grammar.quickanddirtytips.com/formatting-titles-on-twitter-and-facebook.aspx.

Forthcoming or Unpublished Material

Not all forthcoming or unpublished sources are suitable for inclusion in reference lists. Check with your publisher if in doubt.

Forthcoming journal article or book

Journal article:

Farley T, Galves A, Dickinson LM, Perez MJ. Stress, coping, and health: a comparison of Mexican immigrants, Mexican-Americans, and non-Hispanic whites. J Immigr Health. Forthcoming 2005 Jul.

Goldstein DS. Adrenaline and the inner world: an introduction to scientific integrative medicine. Baltimore (MD): Johns Hopkins University Press. Forthcoming 2006.

Paper or poster presented at meeting

Unpublished presentations are cited as follows:

Antani S, Long LR, Thoma GR, Lee DJ. Anatomical shape representation in spine x-ray images. Paper presented at: VIIP 2003. Proceedings of the 3rd IASTED International Conference on Visualization, Imaging and Image Processing; 2003 Sep 8–10; Benalmadena, Spain.

Charles L, Gordner R. Analysis of MedlinePlus en Español customer service requests. Poster session presented at: Futuro magnifico! Celebrating our diversity. MLA ’05: Medical Library Association Annual Meeting; 2005 May 14–19; San Antonio, TX.

References to published presentations are cited much like contributions to books, with the addition of information about the date and place of the conference. See Chapter 29 for more information.

Personal communication

References to personal communication are placed in running text rather than as formal end references.

Permission is usually required and should be acknowledged in an “Acknowledgment” or “Notes” section at the end of the document.

. . . and most of these meningiomas proved to be inoperable (2003 letter from RS Grant to me; unreferenced, see “Notes”) while a few were not.

Name–Year

The following examples illustrate the name–year system. In this system (sometimes called the Harvard system), in-text references consist of the surname of the author or authors and the year of publication of the document. End references are unnumbered and appear in alphabetical order by author and year of publication, with multiple works by the same author listed in chronological order.

Each example of an end reference is accompanied here by an example of a corresponding in-text reference. For more details and many more examples, see Chapter 29 of Scientific Style and Format .

For the end reference, list authors in the order in which they appear in the original text. The year of publication follows the author list. Use periods to separate each element, including author(s), date of publication, article and journal title, and volume or issue information. Location (usually the page range for the article) is preceded by a colon.

Author(s). Date. Article title. Journal title. Volume(issue):location.

For the in-text reference, use parentheses and list author(s) by surname followed by year of publication.

(Author(s) Year)

For articles with 2 authors, names are separated by a comma in the end reference but by “and” in the in-text reference.

Mazan MR, Hoffman AM. 2001. Effects of aerosolized albuterol on physiologic responses to exercise in standardbreds. Am J Vet Res. 62(11):1812–1817.

(Mazan and Hoffman 2001)

For articles with 3 to 10 authors, list all authors in the end reference; in the in-text reference, list only the first, followed by “et al.”

Smart N, Fang ZY, Marwick TH. 2003. A practical guide to exercise training for heart failure patients. J Card Fail. 9(1):49–58.

(Smart et al. 2003)

For articles with more than 10 authors, list the first 10 in the end reference, followed by “et al.”

Pizzi C, Caraglia M, Cianciulli M, Fabbrocini A, Libroia A, Matano E, Contegiacomo A, Del Prete S, Abbruzzese A, Martignetti A, et al. 2002. Low-dose recombinant IL-2 induces psychological changes: monitoring by Minnesota Multiphasic Personality Inventory (MMPI). Anticancer Res. 22(2A):727–732.

(Pizzi et al. 2002)

Laskowski DA. 2002. Physical and chemical properties of pyrethroids. Rev Environ Contam Toxicol. 174:49–170.

(Laskowski 2002)

Gardos G, Cole JO, Haskell D, Marby D, Paine SS, Moore P. 1988. The natural history of tardive dyskinesia. J Clin Pharmacol. 8(4 Suppl):31S–37S.

(Gardos et al. 1988)

Heemskerk J, Tobin AJ, Ravina B. 2002. From chemical to drug: neurodegeneration drug screening and the ethics of clinical trials. Nat Neurosci. 5 Suppl:1027–1029.

(Heemskerk et al. 2002)

Ramstrom O, Bunyapaiboonsri T, Lohmann S, Lehn JM. 2002. Chemical biology of dynamic combinatorial libraries. Biochim Biophys Acta. 1572(2–3):178–186.

(Ramstrom et al. 2002)

Sabatier R. 1995. Reorienting health and social services. AIDS STD Health Promot Exch. (4):1–3.

(Sabatier 1995)

In the end reference, separate information about author(s), date, title, edition, and publication by periods. The basic format is as follows:

Author(s). Date. Title. Edition. Place of publication: publisher. Extent. Notes.

Extent can include information about pagination or number of volumes and is considered optional. Notes can include information of interest to the reader, such as language of publication other than English; such notes are optional. Essential notes provide information about location, such as a URL for online works. See Chapter 29 for more information.

For books with 2 authors, names are separated by a comma in the end reference but by “and” in the in-text reference.

Leboffe MJ, Pierce BE. 2010. Microbiology: laboratory theory and application. Englewood (CO): Morton Publishing Company.

(Leboffe and Pierce 2010)

For books with 3 to 10 authors, list all authors in the end reference; in the in-text reference, list only the first, followed by “et al.”

Ferrozzi F, Garlaschi G, Bova D. 2000. CT of metastases. New York (NY): Springer.

(Ferrozzi et al. 2000)

For books with more than 10 authors, list the first 10 in the end reference, followed by “et al.”

Wenger NK, Sivarajan Froelicher E, Smith LK, Ades PA, Berra K, Blumenthal JA, Certo CME, Dattilo AM, Davis D, DeBusk RF, et al. 1995. Cardiac rehabilitation. Rockville (MD): Agency for Health Care Policy and Research (US).

(Wenger et al. 1995)

[ALSG] Advanced Life Support Group. 2001. Acute medical emergencies: the practical approach. London (England): BMJ Books.

(ALSG 2001)

Klarsfeld A, Revah F. 2003. The biology of death: origins of mortality. Brady L, translator. Ithaca (NY): Cornell University Press.

Luzikov VN. 1985. Mitochondrial biogenesis and breakdown. Galkin AV, translator; Roodyn DB, editor. New York (NY): Consultants Bureau.

(Klarsfeld and Revah 2003)

(Luzikov 1985)

Gawande A. 2010. The checklist manifesto: how to get things right. New York (NY): Metropolitan Books. Chapter 3, The end of the master builder; p. 48–71.

(Gawande 2010)

Rapley R. 2010. Recombinant DNA and genetic analysis. In: Wilson K, Walker J, editors. Principles and techniques of biochemistry and molecular biology. 7th ed. New York (NY): Cambridge University Press. p. 195–262.

(Rapley 2010)

Alkire LG, editor. 2006. Periodical title abbreviations. 16th ed. Detroit (MI): Thompson Gale. 2 vol. Vol. 1, By abbreviation; vol. 2, By title.

(Alkire 2006)

Lutz M. 1989. 1903: American nervousness and the economy of cultural change [dissertation]. [Stanford (CA)]: Stanford University.

(Lutz 1989)

Blanco EE, Meade JC, Richards WD, inventors; Ophthalmic Ventures, assignee. 1990 Nov 13. Surgical stapling system. United States patent US 4,969,591.

(Blanco et al. 1990)

Weiss R. 2003 Apr 11. Study shows problems in cloning people: researchers find replicating primates will be harder than other mammals. Washington Post (Home Ed.). Sect. A:12 (col. 1).

(Weiss 2003)

Johnson D, editor. c2002. Surgical techniques in orthopaedics: anterior cruciate ligament reconstruction [DVD]. Rosemont (IL): American Academy of Orthopaedic Surgeons. 1 DVD.

(Johnson c2002)

Format for end reference:

Title of Homepage. Date of publication. Edition. Place of publication: publisher; [date updated; date accessed]. Notes.

APSnet: plant pathology online. c1994–2005. St Paul (MN): American Phytopathological Association; [accessed 2005 Jun 20]. http://www.apsnet.org/.

For the in-text reference, include only the first word or two of the title (enough to distinguish it from other titles in the reference list), followed by an ellipsis.

(APSnet . . . c1994–2005)

Author(s) of article. Date of publication. Title of article. Title of journal (edition). [date updated; date accessed];Volume(issue):location. Notes.

Savage E, Ramsay M, White J, Beard S, Lawson H, Hunjan R, Brown D. 2005. Mumps outbreaks across England and Wales in 2004: observational study. BMJ. [accessed 2005 May 31];330(7500):1119–1120. http://bmj.bmjjournals.com/cgi/reprint/330/7500/1119. doi:10.1136/bmj.330.7500.1119.

(Savage et al. 2005)

Author(s). Date of publication. Title of book. Edition. Place of publication: publisher; [date updated; date accessed]. Notes.

Brogden KA, Guthmille JM, editors. 2002. Polymicrobial diseases. Washington (DC): ASM Press; [accessed February 28, 2014]. http://www.ncbi.nlm.nih.gov/books/NBK2475/.

(Brogden and Guthmille 2002)

Author’s name. Date of publication. Title of post [descriptive word]. Title of blog. [accessed date]. URL.

Fogarty M. 2012 Aug 14. Formatting titles on Twitter and Facebook [blog]. Grammar Girl: Quick and Dirty Tips for Better Writing. [accessed 2012 Oct 19]. http://grammar.quickanddirtytips.com/formatting-titles-on-twitter-and-facebook.aspx.

(Fogarty 2012)

Farley T, Galves A, Dickinson LM, Perez MJ. Forthcoming 2005 Jul. Stress, coping, and health: a comparison of Mexican immigrants, Mexican-Americans, and non-Hispanic whites. J Immigr Health.

(Farley et al. 2005)

Goldstein DS. Forthcoming 2006. Adrenaline and the inner world: an introduction to scientific integrative medicine. Baltimore (MD): Johns Hopkins University Press.

(Goldstein 2006)

Antani S, Long LR, Thoma GR, Lee DJ. 2003. Anatomical shape representation in spine x-ray images. Paper presented at: VIIP 2003. Proceedings of the 3rd IASTED International Conference on Visualization, Imaging and Image Processing; Benalmadena, Spain.

Charles L, Gordner R. 2005. Analysis of MedlinePlus en Español customer service requests. Poster session presented at: Futuro magnifico! Celebrating our diversity. MLA ’05: Medical Library Association Annual Meeting; San Antonio, TX.

(Atani et al. 2003)

(Charles and Gordner 2005)

References to personal communication are placed in running text rather than as formal end references. Permission is usually required and should be acknowledged in an “Acknowledgment” or “Notes” section at the end of the document.

Scientific Style and Format, 8th Edition text © 2014 by the Council of Science Editors. Scientific Style and Format Online © 2014 by the Council of Science Editors.

Citing sources: Overview

• Citation style guides

Manage your references

Use these tools to help you organize and cite your references:

• Citation Management and Writing Tools

If you have questions after consulting this guide about how to cite, please contact your advisor/professor or the writing and communication center .

Why citing is important

It's important to cite sources you used in your research for several reasons:

• To show your reader you've done proper research by listing sources you used to get your information
• To be a responsible scholar by giving credit to other researchers and acknowledging their ideas
• To avoid plagiarism by quoting words and ideas used by other authors
• To allow your reader to track down the sources you used by citing them accurately in your paper by way of footnotes, a bibliography or reference list

About citations

Citing a source means that you show, within the body of your text, that you took words, ideas, figures, images, etc. from another place.

Citations are a short way to uniquely identify a published work (e.g. book, article, chapter, web site).  They are found in bibliographies and reference lists and are also collected in article and book databases.

Citations consist of standard elements, and contain all the information necessary to identify and track down publications, including:

• author name(s)
• titles of books, articles, and journals
• date of publication
• page numbers
• volume and issue numbers (for articles)

Citations may look different, depending on what is being cited and which style was used to create them. Choose an appropriate style guide for your needs.  Here is an example of an article citation using four different citation styles.  Notice the common elements as mentioned above:

Author - R. Langer

Article Title - New Methods of Drug Delivery

Source Title - Science

Volume and issue - Vol 249, issue 4976

Publication Date - 1990

Page numbers - 1527-1533

American Chemical Society (ACS) style:

Langer, R. New Methods of Drug Delivery. Science 1990 , 249 , 1527-1533.

IEEE Style:

R. Langer, " New Methods of Drug Delivery," Science , vol. 249 , pp. 1527-1533 , SEP 28, 1990 .

American Psychological Association   (APA) style:

Langer, R. (1990) . New methods of drug delivery. Science , 249 (4976), 1527-1533.

Modern Language Association (MLA) style:

Langer, R. " New Methods of Drug Delivery." Science 249.4976 (1990) : 1527-33.

What to cite

You must cite:

• Facts, figures, ideas, or other information that is not common knowledge

Publications that must be cited include:  books, book chapters, articles, web pages, theses, etc.

Another person's exact words should be quoted and cited to show proper credit 

When in doubt, be safe and cite your source!

Avoiding plagiarism

Plagiarism occurs when you borrow another's words (or ideas) and do not acknowledge that you have done so. In this culture, we consider our words and ideas intellectual property; like a car or any other possession, we believe our words belong to us and cannot be used without our permission.

Plagiarism is a very serious offense. If it is found that you have plagiarized -- deliberately or inadvertently -- you may face serious consequences. In some instances, plagiarism has meant that students have had to leave the institutions where they were studying.

The best way to avoid plagiarism is to cite your sources - both within the body of your paper and in a bibliography of sources you used at the end of your paper.

Some useful links about plagiarism:

• MIT Academic Integrity Overview on citing sources and avoiding plagiarism at MIT.
• Avoiding Plagiarism From the MIT Writing and Communication Center.
• Plagiarism: What It is and How to Recognize and Avoid It From Indiana University's Writing Tutorial Services.
• Plagiarism- Overview A resource from Purdue University.
• Next: Citation style guides >>
• Last Updated: Jan 16, 2024 7:02 AM
• URL: https://libguides.mit.edu/citing

Home / Guides / Citation Guides / How to Cite Sources

How to Cite Sources

Here is a complete list for how to cite sources. Most of these guides present citation guidance and examples in MLA, APA, and Chicago.

If you’re looking for general information on MLA or APA citations , the EasyBib Writing Center was designed for you! It has articles on what’s needed in an MLA in-text citation , how to format an APA paper, what an MLA annotated bibliography is, making an MLA works cited page, and much more!

MLA Format Citation Examples

The Modern Language Association created the MLA Style, currently in its 9th edition, to provide researchers with guidelines for writing and documenting scholarly borrowings.  Most often used in the humanities, MLA style (or MLA format ) has been adopted and used by numerous other disciplines, in multiple parts of the world.

MLA provides standard rules to follow so that most research papers are formatted in a similar manner. This makes it easier for readers to comprehend the information. The MLA in-text citation guidelines, MLA works cited standards, and MLA annotated bibliography instructions provide scholars with the information they need to properly cite sources in their research papers, articles, and assignments.

• Book Chapter
• Conference Paper
• Documentary
• Encyclopedia
• Google Images
• Kindle Book
• Memorial Inscription
• Museum Exhibit
• Painting or Artwork
• PowerPoint Presentation
• Sheet Music
• Thesis or Dissertation
• YouTube Video

APA Format Citation Examples

The American Psychological Association created the APA citation style in 1929 as a way to help psychologists, anthropologists, and even business managers establish one common way to cite sources and present content.

APA is used when citing sources for academic articles such as journals, and is intended to help readers better comprehend content, and to avoid language bias wherever possible. The APA style (or APA format ) is now in its 7th edition, and provides citation style guides for virtually any type of resource.

Chicago Style Citation Examples

The Chicago/Turabian style of citing sources is generally used when citing sources for humanities papers, and is best known for its requirement that writers place bibliographic citations at the bottom of a page (in Chicago-format footnotes ) or at the end of a paper (endnotes).

The Turabian and Chicago citation styles are almost identical, but the Turabian style is geared towards student published papers such as theses and dissertations, while the Chicago style provides guidelines for all types of publications. This is why you’ll commonly see Chicago style and Turabian style presented together. The Chicago Manual of Style is currently in its 17th edition, and Turabian’s A Manual for Writers of Research Papers, Theses, and Dissertations is in its 8th edition.

Citing Specific Sources or Events

• Declaration of Independence
• Gettysburg Address
• Martin Luther King Jr. Speech
• President Obama’s Farewell Address
• President Trump’s Inauguration Speech
• White House Press Briefing

Additional FAQs

• Citing Archived Contributors
• Citing a Blog
• Citing a Book Chapter
• Citing a Source in a Foreign Language
• Citing an Image
• Citing a Song
• Citing Special Contributors
• Citing a Translated Article
• Citing a Tweet

6 Interesting Citation Facts

The world of citations may seem cut and dry, but there’s more to them than just specific capitalization rules, MLA in-text citations , and other formatting specifications. Citations have been helping researches document their sources for hundreds of years, and are a great way to learn more about a particular subject area.

Ever wonder what sets all the different styles apart, or how they came to be in the first place? Read on for some interesting facts about citations!

1. There are Over 7,000 Different Citation Styles

You may be familiar with MLA and APA citation styles, but there are actually thousands of citation styles used for all different academic disciplines all across the world. Deciding which one to use can be difficult, so be sure to ask you instructor which one you should be using for your next paper.

2. Some Citation Styles are Named After People

While a majority of citation styles are named for the specific organizations that publish them (i.e. APA is published by the American Psychological Association, and MLA format is named for the Modern Language Association), some are actually named after individuals. The most well-known example of this is perhaps Turabian style, named for Kate L. Turabian, an American educator and writer. She developed this style as a condensed version of the Chicago Manual of Style in order to present a more concise set of rules to students.

3. There are Some Really Specific and Uniquely Named Citation Styles

How specific can citation styles get? The answer is very. For example, the “Flavour and Fragrance Journal” style is based on a bimonthly, peer-reviewed scientific journal published since 1985 by John Wiley & Sons. It publishes original research articles, reviews and special reports on all aspects of flavor and fragrance. Another example is “Nordic Pulp and Paper Research,” a style used by an international scientific magazine covering science and technology for the areas of wood or bio-mass constituents.

4. More citations were created on  EasyBib.com  in the first quarter of 2018 than there are people in California.

The US Census Bureau estimates that approximately 39.5 million people live in the state of California. Meanwhile, about 43 million citations were made on EasyBib from January to March of 2018. That’s a lot of citations.

5. “Citations” is a Word With a Long History

The word “citations” can be traced back literally thousands of years to the Latin word “citare” meaning “to summon, urge, call; put in sudden motion, call forward; rouse, excite.” The word then took on its more modern meaning and relevance to writing papers in the 1600s, where it became known as the “act of citing or quoting a passage from a book, etc.”

6. Citation Styles are Always Changing

The concept of citations always stays the same. It is a means of preventing plagiarism and demonstrating where you relied on outside sources. The specific style rules, however, can and do change regularly. For example, in 2018 alone, 46 new citation styles were introduced , and 106 updates were made to exiting styles. At EasyBib, we are always on the lookout for ways to improve our styles and opportunities to add new ones to our list.

Why Citations Matter

Here are the ways accurate citations can help your students achieve academic success, and how you can answer the dreaded question, “why should I cite my sources?”

They Give Credit to the Right People

Citing their sources makes sure that the reader can differentiate the student’s original thoughts from those of other researchers. Not only does this make sure that the sources they use receive proper credit for their work, it ensures that the student receives deserved recognition for their unique contributions to the topic. Whether the student is citing in MLA format , APA format , or any other style, citations serve as a natural way to place a student’s work in the broader context of the subject area, and serve as an easy way to gauge their commitment to the project.

They Provide Hard Evidence of Ideas

Having many citations from a wide variety of sources related to their idea means that the student is working on a well-researched and respected subject. Citing sources that back up their claim creates room for fact-checking and further research . And, if they can cite a few sources that have the converse opinion or idea, and then demonstrate to the reader why they believe that that viewpoint is wrong by again citing credible sources, the student is well on their way to winning over the reader and cementing their point of view.

They Promote Originality and Prevent Plagiarism

The point of research projects is not to regurgitate information that can already be found elsewhere. We have Google for that! What the student’s project should aim to do is promote an original idea or a spin on an existing idea, and use reliable sources to promote that idea. Copying or directly referencing a source without proper citation can lead to not only a poor grade, but accusations of academic dishonesty. By citing their sources regularly and accurately, students can easily avoid the trap of plagiarism , and promote further research on their topic.

They Create Better Researchers

By researching sources to back up and promote their ideas, students are becoming better researchers without even knowing it! Each time a new source is read or researched, the student is becoming more engaged with the project and is developing a deeper understanding of the subject area. Proper citations demonstrate a breadth of the student’s reading and dedication to the project itself. By creating citations, students are compelled to make connections between their sources and discern research patterns. Each time they complete this process, they are helping themselves become better researchers and writers overall.

When is the Right Time to Start Making Citations?

Make in-text/parenthetical citations as you need them.

As you are writing your paper, be sure to include references within the text that correspond with references in a works cited or bibliography. These are usually called in-text citations or parenthetical citations in MLA and APA formats. The most effective time to complete these is directly after you have made your reference to another source. For instance, after writing the line from Charles Dickens’ A Tale of Two Cities : “It was the best of times, it was the worst of times…,” you would include a citation like this (depending on your chosen citation style):

(Dickens 11).

This signals to the reader that you have referenced an outside source. What’s great about this system is that the in-text citations serve as a natural list for all of the citations you have made in your paper, which will make completing the works cited page a whole lot easier. After you are done writing, all that will be left for you to do is scan your paper for these references, and then build a works cited page that includes a citation for each one.

Need help creating an MLA works cited page ? Try the MLA format generator on EasyBib.com! We also have a guide on how to format an APA reference page .

2. Understand the General Formatting Rules of Your Citation Style Before You Start Writing

While reading up on paper formatting may not sound exciting, being aware of how your paper should look early on in the paper writing process is super important. Citation styles can dictate more than just the appearance of the citations themselves, but rather can impact the layout of your paper as a whole, with specific guidelines concerning margin width, title treatment, and even font size and spacing. Knowing how to organize your paper before you start writing will ensure that you do not receive a low grade for something as trivial as forgetting a hanging indent.

Don’t know where to start? Here’s a formatting guide on APA format .

3. Double-check All of Your Outside Sources for Relevance and Trustworthiness First

Collecting outside sources that support your research and specific topic is a critical step in writing an effective paper. But before you run to the library and grab the first 20 books you can lay your hands on, keep in mind that selecting a source to include in your paper should not be taken lightly. Before you proceed with using it to backup your ideas, run a quick Internet search for it and see if other scholars in your field have written about it as well. Check to see if there are book reviews about it or peer accolades. If you spot something that seems off to you, you may want to consider leaving it out of your work. Doing this before your start making citations can save you a ton of time in the long run.

Finished with your paper? It may be time to run it through a grammar and plagiarism checker , like the one offered by EasyBib Plus. If you’re just looking to brush up on the basics, our grammar guides  are ready anytime you are.

How useful was this post?

Click on a star to rate it!

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Citation Basics

Harvard Referencing

Plagiarism Basics

Plagiarism Checker

Upload a paper to check for plagiarism against billions of sources and get advanced writing suggestions for clarity and style.

Get Started

• UNC Libraries
• HSL Academic Process
• Writing and Citing Resources: How to Write Scientific Papers
• How to Cite

Writing and Citing Resources: How to Write Scientific Papers: How to Cite

Created by health science librarians.

• Scientific Writing Resources

Citation and Style Manuals

Resources to help with citation formatting, other citation guides @ unc.

• Citation Tools: EndNote, SciWheel...

Citation Style Guides

• AMA Style Guide (HSL)
• APA Style Guide (HSL)

Electronic Books

• Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly Work in Medical Journals (ICMJE Recommendations) Publication Date: updated August 2013

Print Books (title links goes to the library catalog)

UNC Libraries' Citation Tools

• Comparing Reference Managers Chart comparing features of tools used to manage references includes EndNote, F1000W, Mendeley, and Zotero. Links to guides for each one provides "how to use" information.
• Citation Builder UNC's Citation Builder let's you quickly build citations APA, MLA, Chicago styles for a variety of formats.
• Citing Information Tutorial The UNC-Chapel Hill University Libraries' Citing Information tutorial introduces you to citing information in a number of citation styles such as APA, MLA, Chicago, and CSE/CBE.

Citation Formatting Web Sites

• Colorado Writing Center: Documenting Sources Links to detailed guides for APA, MLA, Chicago, CSE Name/Year System and CSE Citation/Sequence System.
• OWL at Purdue Research and Citation Resources Guides to APA, MLA, and Chicago citation styles.
• APA Style Help Links to FAQs; a flash tutorial that covers the basics; the Learning Resources section for more in-depth instruction; and the APA style blog; all from the American Psychological Association.
• Council of Science Editors (CSE) Quick Citation Guide
• CSE/CBE: Sample References Page
• ICMJE Sample References Sample references for the International Committee of Medical Journal Editors (ICMJE) Uniform Requirements for Manuscripts Submitted to Biomedical Journals.
• AMA Style Guide by Elizabeth Moreton, MLS Last Updated Mar 28, 2024 2530 views this year
• APA Style Guide by Elizabeth Moreton, MLS Last Updated Feb 23, 2024 1386 views this year
• Choosing a Citation Manager by Elizabeth Moreton, MLS Last Updated Feb 23, 2024 670 views this year
• Copyright Basics for the Health Sciences by Elizabeth Moreton, MLS Last Updated Sep 15, 2022 838 views this year
• EndNote Basic by Elizabeth Moreton, MLS Last Updated Aug 24, 2023 8504 views this year
• EndNote Desktop: X9 & 20 by Elizabeth Moreton, MLS Last Updated Feb 23, 2024 4506 views this year
• How to Cite Data by Michele Hayslett Last Updated Feb 8, 2024 1366 views this year
• Mendeley by Elizabeth Moreton, MLS Last Updated Feb 23, 2024 1713 views this year
• Plagiarism and Citing Sources (Health Affairs) by Elizabeth Moreton, MLS Last Updated Feb 23, 2024 2500 views this year
• Sciwheel by Barbara Rochen Renner, PhD Last Updated Jan 31, 2024 1759 views this year
• Writing and Citing Resources: How to Write Scientific Papers by Elizabeth Moreton, MLS Last Updated Feb 23, 2024 81 views this year
• Writing in the Health Sciences For Faculty and Students by Barbara Rochen Renner, PhD Last Updated Apr 18, 2024 387 views this year
• Zotero by Rolando Rodriguez Last Updated Feb 23, 2024 2560 views this year
• << Previous: Scientific Writing Resources
• Next: Citation Tools: EndNote, SciWheel... >>
• Last Updated: Feb 23, 2024 11:33 AM
• URL: https://guides.lib.unc.edu/writing-citing

Search & Find

• E-Research by Discipline
• More Search & Find

Places & Spaces

• Places to Study
• Book a Study Room
• Printers, Scanners, & Computers
• More Places & Spaces
• Borrowing & Circulation
• Request a Title for Purchase
• Schedule Instruction Session
• More Services

Support & Guides

• Course Reserves
• Research Guides
• Citing & Writing
• More Support & Guides
• Mission Statement
• Diversity Statement
• Staff Directory
• Job Opportunities
• Give to the Libraries
• News & Exhibits
• Reckoning Initiative
• More About Us

• Search This Site
• Privacy Policy
• Accessibility
• Give Us Your Feedback
• 208 Raleigh Street CB #3916
• Chapel Hill, NC 27515-8890
• 919-962-1053

Scientific Papers and Lab Reports: Citing in APA

• Finding Scientific Information
• Writing a Lab Report
• Writing a Scientific Paper
• How to Read Scientific Papers

Citing in APA

Use this page to create the References portion of your scientific paper and/or lab report in the APA citation style. Why cite? Check out our Academic Honesty/Plagiarism online tutorial for the whys and hows of avoiding plagiarism.

APA Video Walkthrough

Use the following video  and sites to learn about proper citation in APA. In addition, learn about cross-checking your citations (this video uses mostly MLA citations but gives a good idea of the practice of cross-checking). 

Covers the basic citation rules and provides citation examples of the commonly used source types.

A guide from Purdue University on using APA guidelines in research papers and and citing all sources. A good resource for more complex APA sources. 

You can also create citations using generators.  Remember : it's your responsibility to double check the citations for accuracy!

A citation generator for MLA, APA, Turabian and Chicago styles. Popular with students.

Citation generator created by the Hekman Library of Calvin College, it assists with creating citations in MLA, APA, and Chicago. Popular with me, the librarian.

A Firefox only extension that helps with the collection, management, and citation of sources.

• << Previous: How to Read Scientific Papers
• Next: Get Help! >>
• Last Updated: Jan 17, 2024 11:04 AM
• URL: https://researchguides.austincc.edu/scientificwritinglabreports

ScienceDirect Support Center

To post social content, you must have a display name. The page will refresh upon submission. Any pending input will be lost.

How do I cite a ScienceDirect article?

An article citation is typically made up of the author(s), article title, publication title, date of publication, and page numbers (or article number). Consult the journal’s reference style for the exact appearance of the article citation elements, abbreviation of the journal name, and the use of punctuation.

General principles for citing articles

There are some general principles for citing articles:

• Regardless of reference style, always include the article number where the page number (or page range) would otherwise go.
• Never cite the internal page numbering starting at ‘1’.
• Include the DOI if known.

Citing articles which are not final

Articles which are not final (e.g., a journal pre-proof) or do not contain all the typical elements of an article citation can be cited using the year of online publication and the DOI, as follows: author(s), article title, publication (year), DOI. For more information on creating and citing DOI links, visit the DOI website .

• A.U. Thor, Title of article, Favorite Journal (2020), https://dx.doi.org/10.1016/doi-suffix, or
• A.U. Thor, Title of article, Favorite Journal, https://dx.doi.org/10.1016/doi-suffix.
• A.U. Thor, Title of article, Favorite Journal 5 (1) (2020) 37-65, https://dx.doi.org/10.1016/doi-suffix.
• A.U. Thor, Title of article, Favorite Journal 5 (1) (2020) 101357, https://dx.doi.org/10.1016/doi-suffix.

Was this answer helpful?

Thank you for your feedback, it will help us serve you better. If you require assistance, please scroll down and use one of the contact options to get in touch.

Help us to help you:

Thank you for your feedback!

• Why was this answer not helpful?
• It was hard to understand / follow.
• It did not answer my question.
• The solution did not work.
• There was a mistake in the answer.
• Feel free to leave any comments below: Please enter your feedback to submit this form

Related Articles:

• Where can I find the DOI?
• What are Article Metrics?
• What can I do on an article page?
• What can I do on a journal home page?
• What are journal pre-proofs?

For further assistance:

An official website of the United States government

The .gov means it’s official. Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

The site is secure. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

• Publications
• Account settings

Preview improvements coming to the PMC website in October 2024. Learn More or Try it out now .

• Advanced Search
• Journal List
• Indian J Orthop
• v.53(3); May-Jun 2019

Formatting References for Scientific Manuscripts

Srinivas b s kambhampati.

Sri Dhaatri Orthopaedic, Maternity and Gynaecology Center, Vijayawada, Andhra Pradesh, India

Lalit Maini

1 Department of Orthopaedics, Maulana Azad Medical College, New Delhi, India

While references are an essential and integral part of a scientific manuscript, format and style of references are as varied as the number of journals currently present. International Committee of Medical Journal Editors in their latest recommendations for publication, 1 advice authors to quote original references whenever possible. We would recommend the readers to go through these guidelines as they are given in sufficient detail to submit a good set of references including styling. Other resources for citing references include the PubMed section 2 which gives samples of formatting of different reference types and the eBook: Citing Medicine, 3 published by the U. S. National Library of Medicine, which gives assistance and rules to authors, editors, publishers and librarians for formatting of references for different reference types.

References are formatted in two basic styles – the Vancouver style which is numeric (more commonly used in medical journals) and Harvard which uses author-date style (more commonly used in natural and Social sciences journals). 4 Parts and order of the parts cited differ on what the author is citing (reference type) and the journal that is being submitted to. The most common types of references include journal article, book, book section or chapter, dissertation, monograph, and webpage. As an example, for a journal article, the parts of a reference in the sequence include authors, article title, journal title, date of publication, volume, issue, and location/pagination. Each journal has its own modification of the format for each part and the punctuation marks, or their lack of, between the parts. Formatting style in each part of a reference could involve placement of selected punctuation marks, bold and italics enhancements, alphabetical order or sequential ordering of references and style of citing in the text, making the combination of variations that create a unique reference style as large in number as the number of journals currently published. It is not clear why such a system has evolved, but it requires considerable attention to detail to get the formatting correct and is time-consuming for the author. The tradition of the journal has been thought as one of the reasons. 4 In manuscripts submitted for the Indian Journal of Orthopaedics (IJO), the reference section carries the most formatting errors committed by authors.

The advantage of having a constant style within a journal is two-fold, apart from an esthetic appearance of references across all articles published by the journal. Ease of reading the references at the end of each article and ease of finding reference part by the reader if he/she is used to the format and plans to look up the reference. As a student/professional in the medical field, one would require attention to finer details of his/her research work as well as in their clinical practice and hence exercising attention to the references would help improve those skills. Such a wide variation in the styles of references has also benefitted some software companies who deal with reference managers (RMs). Some RMs are free for use, and the authors are advised to use different RMs to see which one suits their needs best. While some RMs are cloud based, others are computer based and do not require an internet connection while some others are cloud and computer based. The variation in the style of references across journals appears unlikely to be standardized to a single universal format in the near future.

The Citation Style Language (CSL) is an XML-based computer language developed to standardize formatting of citations and references in manuscripts submitting to journals. They are text application editable files which are imported into RMs. An increasing number of RMs use CSL to help users format their list of references according to individual journal guidelines. However, not all journals are supported by CSL files.

There are two main repositories for access to CSL files – One by GitHub 5 and the other by Zotero 6 developed by Corporation for Digital Scholarship and Roy Rosenzweig Center for History and New Media. These contain more than 8500 styles of references. Authors using Zotero, Mendeley, RefWorks, Papers, CrossRef, Bibliography, and some 42 other RMs can use these CSL files to manage references within them. IJO did not have a CSL file until now in both the repositories. In this scenario, there are a few options for the authors preparing references for a manuscript. First, to type and style references manually which would take a long time and prone to human errors. Second, a CSL file similar to IJO may be selected from the repository and used and later manually edited, if any needed. However, this involves searching for an exact match of style for a journal registered in the repository of CSL files. Third, there are RMs with inbuilt options to format references while citing in the text. This option is independent of CSL. The disadvantage here is that the author is bound by the list of reference styles already loaded within the software. They may not be able to add new formats. Fourth, some RMs allow authors to prepare a style, but this would take some time to prepare if the style is not already inbuilt. As a fifth option, a CSL file that is close to IJO may be chosen, and the code of this file tweaked with minor editing to convert it for use with IJO. To do that, the author must be familiar with programming or editing of HTML/XML files since HTML is a language that is closer to XML.

Zotero's repository 7 website has a user-friendly interface in which such searches are easier to perform. It has 9357 styles stored in the repository at the time of writing this article on March 17, 2019. There are 1924 unique styles through which one can search if their required journal is listed. Zotero draws CSL files from GitHub into their repository. Hence, if a file is created in GitHub, it is drawn into Zotero by default. CSL Project 8 is a website sponsored by four well known RMs. These are Zotero, Mendeley, 9 Papers, 10 and RefWorks. 11 This website gives detailed specifications and documentation of CSL language if one is interested in coding these files. If one is proficient with XML, they can create a style and submit it to the GitHub website for others to benefit. Editing is easier if one uses the Zotero RM as it has an inbuilt option to edit style. It can be done even in other managers or with the use of a standard text editing application in Windows or Mac operating systems. Once a new CSL file is developed, in order to publish it, it has to be validated by CSL validator website 12 and submitted at the GitHub site for accepting into the repository. Even finer details like number of author names before et al. while formatting reference, punctuation marks and their placement, style of each part of the reference and each style of the reference, etc., can be edited accurately.

Once developed, the output of references and citations is remarkably consistent, and too much time need not be directed to editing the punctuation marks and styling of the references and citations while preparing the manuscript. The only hurdle after this would be to get full details of the references reliably and accurately into the RM database while importing the references. The author needs to check that the references were properly imported into the database. If verified, they may be used any number of times with precision. With appropriate selection, the citing as well as the list of references can be formatted according to the journal that is being considered, for submission. Those who are already using RMs may be well aware of the advantages and the time such CSL files can save while preparing a manuscript.

We are happy to inform that a CSL file for IJO has now been created in the GitHub repository 1 and Zotero Styles repository 3 and it can be used by authors using the RMs listed in the CSL website and benefit from its use. The direct link of the file in the repository is given 13 [ Figure 1 ]. Basic users of RMs may download it through their RMs by selecting Indian Journal of Orthopaedics option. Advanced users who know where to place this file may access using the weblink given. Examples of reference style and citation for IJO are given in Figure 2 .

Screenshot of browser shows the web address and search words used to retrieve Citation Style Language file for Indian Journal of Orthopaedics

Examples of format of references and their citation in text for the Indian Journal of Orthopaedics

• PRO Courses Guides New Tech Help Pro Expert Videos About wikiHow Pro Upgrade Sign In
• EDIT Edit this Article
• EXPLORE Tech Help Pro About Us Random Article Quizzes Request a New Article Community Dashboard This Or That Game Popular Categories Arts and Entertainment Artwork Books Movies Computers and Electronics Computers Phone Skills Technology Hacks Health Men's Health Mental Health Women's Health Relationships Dating Love Relationship Issues Hobbies and Crafts Crafts Drawing Games Education & Communication Communication Skills Personal Development Studying Personal Care and Style Fashion Hair Care Personal Hygiene Youth Personal Care School Stuff Dating All Categories Arts and Entertainment Finance and Business Home and Garden Relationship Quizzes Cars & Other Vehicles Food and Entertaining Personal Care and Style Sports and Fitness Computers and Electronics Health Pets and Animals Travel Education & Communication Hobbies and Crafts Philosophy and Religion Work World Family Life Holidays and Traditions Relationships Youth
• Browse Articles
• Learn Something New
• Quizzes Hot
• This Or That Game New
• Train Your Brain
• Explore More
• Support wikiHow
• About wikiHow
• Log in / Sign up
• Education and Communications
• College University and Postgraduate
• Academic Writing
• Research Papers

How to Cite a Research Paper

Last Updated: March 29, 2024 Fact Checked

This article was reviewed by Gerald Posner and by wikiHow staff writer, Jennifer Mueller, JD . Gerald Posner is an Author & Journalist based in Miami, Florida. With over 35 years of experience, he specializes in investigative journalism, nonfiction books, and editorials. He holds a law degree from UC College of the Law, San Francisco, and a BA in Political Science from the University of California-Berkeley. He’s the author of thirteen books, including several New York Times bestsellers, the winner of the Florida Book Award for General Nonfiction, and has been a finalist for the Pulitzer Prize in History. He was also shortlisted for the Best Business Book of 2020 by the Society for Advancing Business Editing and Writing. There are 8 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 413,231 times.

When writing a paper for a research project, you may need to cite a research paper you used as a reference. The basic information included in your citation will be the same across all styles. However, the format in which that information is presented is somewhat different depending on whether you're using American Psychological Association (APA), Modern Language Association (MLA), Chicago, or American Medical Association (AMA) style.

Referencing a Research Paper

• In APA style, cite the paper: Last Name, First Initial. (Year). Title. Publisher.
• In Chicago style, cite the paper: Last Name, First Name. “Title.” Publisher, Year.
• In MLA style, cite the paper: Last Name, First Name. “Title.” Publisher. Year.

Citation Help

• For example: "Kringle, K., & Frost, J."

• For example: "Kringle, K., & Frost, J. (2012)."
• If the date, or any other information, are not available, use the guide at https://blog.apastyle.org/apastyle/2012/05/missing-pieces.html .

• For example: "Kringle, K., & Frost, J. (2012). Red noses, warm hearts: The glowing phenomenon among North Pole reindeer."
• If you found the research paper in a database maintained by a university, corporation, or other organization, include any index number assigned to the paper in parentheses after the title. For example: "Kringle, K., & Frost, J. (2012). Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. (Report No. 1234)."

• For example: "Kringle, K., & Frost, J. (2012). Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. (Report No. 1234). Retrieved from Alaska University Library Archives, December 24, 2017."

• For example: "(Kringle & Frost, 2012)."
• If there was no date on the research paper, use the abbreviation n.d. : "(Kringle & Frost, n.d.)."

• For example: "Kringle, Kris, and Jack Frost."

• For example: "Kringle, Kris, and Jack Frost. "Red Noses, Warm Hearts: The Glowing Phenomenon among North Pole Reindeer." Master's thesis."

• For example: "Kringle, Kris, and Jack Frost. "Red Noses, Warm Hearts: The Glowing Phenomenon among North Pole Reindeer." Master's thesis, Alaska University, 2012."

• For example: "Kringle, Kris, and Jack Frost. "Red Noses, Warm Hearts: The Glowing Phenomenon among North Pole Reindeer." Master's thesis, Alaska University, 2012. Accessed at https://www.northpolemedical.com/raising_rudolf."

• Footnotes are essentially the same as the full citation, although the first and last names of the authors aren't inverted.
• For parenthetical citations, Chicago uses the Author-Date format. For example: "(Kringle and Frost 2012)."

• For example: "Kringle, Kris, and Frost, Jack."

• For example: "Kringle, Kris, and Frost, Jack. "Red Noses, Warm Hearts: The Glowing Phenomenon Among North Pole Reindeer.""

• For example, suppose you found the paper in a collection of paper housed in university archives. Your citation might be: "Kringle, Kris, and Frost, Jack. "Red Noses, Warm Hearts: The Glowing Phenomenon Among North Pole Reindeer." Master's Theses 2000-2010. University of Alaska Library Archives. Accessed December 24, 2017."

• For example: "(Kringle & Frost, p. 33)."

• For example: "Kringle K, Frost J."

• For example: "Kringle K, Frost J. Red noses, warm hearts: The glowing phenomenon among North Pole reindeer."

• For example: "Kringle K, Frost J. Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. Nat Med. 2012; 18(9): 1429-1433."

• For example, if you're citing a paper presented at a conference, you'd write: "Kringle K, Frost J. Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. Oral presentation at Arctic Health Association Annual Summit; December, 2017; Nome, Alaska."
• To cite a paper you read online, you'd write: "Kringle K, Frost J. Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. https://www.northpolemedical.com/raising_rudolf"

• For example: "According to Kringle and Frost, these red noses indicate a subspecies of reindeer native to Alaska and Canada that have migrated to the North Pole and mingled with North Pole reindeer. 1 "

Community Q&A

• If you used a manual as a source in your research paper, you'll need to learn how to cite the manual also. Thanks Helpful 0 Not Helpful 0
• If you use any figures in your research paper, you'll also need to know the proper way to cite them in MLA, APA, AMA, or Chicago. Thanks Helpful 0 Not Helpful 0

You Might Also Like

• ↑ https://askus.library.wwu.edu/faq/116659
• ↑ https://guides.libraries.psu.edu/apaquickguide/intext
• ↑ https://owl.purdue.edu/owl/research_and_citation/chicago_manual_17th_edition/cmos_formatting_and_style_guide/general_format.html
• ↑ https://libanswers.snhu.edu/faq/48009
• ↑ https://www.chicagomanualofstyle.org/tools_citationguide/citation-guide-2.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/mla_style/mla_formatting_and_style_guide/mla_in_text_citations_the_basics.html
• ↑ https://morningside.libguides.com/MLA8/location
• ↑ https://owl.purdue.edu/owl/research_and_citation/ama_style/index.html

About This Article

To cite a paper APA style, start with the author's last name and first initial, and the year of publication. Then, list the title of the paper, where you found it, and the date that you accessed it. In a paper, use a parenthetical reference with the last name of the author and the publication year. For an MLA citation, list the author's last name and then first name and the title of the paper in quotations. Include where you accessed the paper and the date you retrieved it. In your paper, use a parenthetical reference with the author's last name and the page number. Keep reading for tips on Chicago and AMA citations and exceptions to the citation rules! Did this summary help you? Yes No

• Send fan mail to authors

Did this article help you?

Featured Articles

Trending Articles

Watch Articles

• Terms of Use
• Privacy Policy
• Do Not Sell or Share My Info
• Not Selling Info

Get all the best how-tos!

Sign up for wikiHow's weekly email newsletter

Citation Styles

• Chicago Style

What is ACS?

Citing your sources in acs style, reference list citation examples for common source types, acs style manual in the library.

• Annotated Bibliographies
• Literature Reviews
• Zotero (Citation Management)

• A documentation style for writing and formatting scientific research papers including citing sources
• Includes information about reviewing and submitting scientific manuscripts  
• Created by the American Chemical Society
• The ACS Style Guide contains comprehensive and explanations for proper scientific communication and style guidelines
• ACS Quick Guide From Oregon State
• ZoteroBib ZoteroBib is a free service that helps you quickly create a bibliography in any citation style.

How to cite in ACS style

1. In-Text Citations

• Use an in-text citation to acknowledge that you are quoting or paraphrasing another author's words, ideas or data in the text of your research paper.
• Add a superscript number at the end of the text being cited
• Use an italic number in parentheses at the end of the text being cited
• ​Put author’s name and resource publication date in parentheses at the end of the text being cited
• For numerical in-text citations, assign one number to each source, in the order they are referenced in your paper.

2. References List

• Include a reference list at the end of your paper. The list should begin on a new page and contain a full citation for each in-text citation referenced within your paper.
• Each full citation should include the specific publication information required by the American Chemical Society rules. This allows your reader to find the sources, if desired.
• If you used superscript or italic numbers for your in-text citations, arrange your reference list in numerical order.
• If you used author's name and date for your in-text citations, arrange your reference list alphabetically by the last name of the author.

Basic Format:

Author 1; Author 2; etc. Title of Book , Edition Number; Publisher: Location, Year; Volume number, pp Pages Used.

Le Couteur, P.; Burreson, J.  Napoleon's Buttons: How 17 Molecules Changed History ; Jeremy P. Tarcher/Putnam: New York, 2003; pp 32-47.

Author 1; Author 2; Author 3; etc. Book Title [Online]; Series Information; Publisher: Place of Publication, Year; Volume Number, Pages Used.      URL (accessed Month Day, Year).

Lo, K. K. Luminescent and Photoactive Transition Metal Complexes as Biomolecular Probes and Cellular Reagents [Online]; Springer:      Berlin, 2015. https://librarysearch.williams.edu/permalink/f/s1eqoc/01WIL_ALMA51121331050002786 (accessed Jan 19, 2020).

Magazine or Newspaper Articles

Author 1; Author 2; Author 3; etc. Title of Article.  Title of Periodical,  Complete Date, Pages.

Manning, R. Super Organics.  Wired,  May 2004, pp 176-181.

• For newspapers, include "p." or "pp." before the page numbers. If the article appears on discontinuous pages, give all page numbers separated by a comma.
• If retrieved online, include "Retrieved from" and the URL.

Scholarly Journal Article (Accessed Online via Open Web)

Author 1; Author 2; Author 3; etc. Title of Article. Journal Abbreviation [Online] Year, Issue, Pages. Complete URL (accessed Date).

Peacock-Lopez, E. Exact Solutions of the Quantum Double Square-Well Potential.  Chem. Ed.  [Online]  2007 ,  11 , 383-393.      http://chemeducator.org/bibs/0011006/11060383ep.htm (accessed Dec 6, 2018).

Scholarly Journal Article (Accessed via Library Database)

Author 1; Author 2; Author 3; etc. Title of Article. Journal Abbreviation [Online], Date, Pages. Database Name. Complete URL of database      (accessed Date).

Begley, S. When Does Your Brain Stop Making New Neurons? Newsweek [Online] July 2, 2007, p 62. Expanded Academic Index.      http:/galegroup.com (accessed Aug 23, 2007).

Scholarly Journal Article (Accessed in Print)

Author 1; Author 2; Author 3; etc. Title of Article.  Journal Abbreviation   Year ,  Volume , Pages.

Evans, D. A.; Fitch, D. M.; Smith, T. E.; Cee, V. J. Application of Complex Aldol Reactions to the Total Synthesis of Phorboxazole B.       J. Am. Chem. Soc.   2000,   122 , 10033-10046.

Author, X (if any). Title of Site. URL (accessed Month Day, Year), other identifying information (if any).

National Library of Medicine. Environmental Health & Toxicology. https://www.nlm.nih.gov/enviro/index.html (accessed Feb 04, 2020).

• << Previous: ASA Style
• Next: CSE Style >>
• Last Updated: Jan 17, 2024 2:47 PM
• URL: https://researchguides.elac.edu/Citation

• Langson Library
• Science Library
• Grunigen Medical Library
• Law Library
• Connect From Off-Campus
• Accessibility
• Gateway Study Center

Email this link

Writing a scientific paper.

• Writing a lab report
• INTRODUCTION

Literature Cited Section

Guides from other schools, citation styles & writing guides, "literature cited checklist" from: how to write a good scientific paper. chris a. mack. spie. 2018..

• Bibliography of guides to scientific writing and presenting
• Peer Review
• Presentations
• Lab Report Writing Guides on the Web

This is the last section of the paper. Here you should provide an alphabetical listing of all the published work you cited in the text of the paper. This does not mean every article you found in your research; only include the works you actually cited in the text of your paper. A standard format is used both to cite literature in the text and to list these studies in the Literature Cited section.  Hypothetical examples of the format used in the journal Ecology are below:     Djorjevic, M., D.W. Gabriel and B.G. Rolfe. 1987. Rhizobium: Refined parasite of legumes. Annual Review of Phytopathology 25: 145-168.     Jones, I. J. and B. J. Green. 1963. Inhibitory agents in walnut trees. Plant Physiology 70:101-152.     MacArthur, R.H. and E.O. Wilson. 1967. The Theory of Island Biogeography. Princeton University Press, Princeton, N.J.     Smith, E. A. 1949. Allelopathy in walnuts. American Journal of Botany 35:1066-1071. Here is a dissection of the first entry, in the format for Ecology :       Firstauthor, M., D.W. Secondauthor and B.G. Thirdauthor. Year. Article title with only the first letter capitalized. Journal Article Title with Important Words in Caps  volume#(issue# if there is one): firstpage-lastpage. Notice some of the following details:       - the list is alphabetized;     - no first or middle names are listed (the author's first and middle initials are used instead);     - only the first word in the title of the journal article (except for proper nouns) is capitalized;     - different journals use different styles for Literature Cited sections.   You should pay careful attention to details of formatting when you write your own Literature Cited section. For papers published in journals you must provide the date, title, journal name, volume number, and page numbers. For books you need the publication date, title, publisher, and place of publication.

• Bates College Guide to Citing Sources
• American Psychological Association (APA) style A guide to formatting papers using APA from Purdue University.
• APA 2007 Revision of Citation Styles An online revision of the information presented in the fifth edition of the Publication Manual of the American Psychological Association . more... less... This guide serves a resource for citation styles and uniform means of referencing authoritative works.
• APA Documentation (University of Wisconsin-Madison) A quick resource for citing references in papers using the 5th edition of the Publication Manual of the American Psychological Association (2001). Provided by The Writing Center at the University of Wisconsin-Madison.
• American Anthropological Association Style Manual Prepared for and preferred by the American Anthropological Association (AAA) using the Chicago Manual of Style. Citation examples listed from pages 10-14. Also recommend consulting the Chicago Manual of Style Online.

• Elements of Style This classic work by William Strunk is intended for use in which the practice of composition is combined with the study of literature. It gives the main requirements of plain English style and concentrates on the rules of usage most often abused.
• IEEE Editorial Style Manual This link will take you to a downloadable version of the IEEE Editorial Style Manual.
• Modern Language Association (MLA) style
• Purdue OWL (Online Writing Lab) Easy-to-use site that provides information and examples for using the American Psychological Association (APA) citation and format style and the Modern Language Association (MLA) citation and format style. Also included information about the Chicago Manual of Style (16th ed.)
• Include citations that provide sufficient context to allow for critical analysis of this
• work by others.
• Include citations that give the reader sources of background and related material so
• that the current work can be understood by the target audience.
• Include citations that provide examples of alternate ideas, data, or conclusions to
• compare and contrast with this work, if they exist. Do not exclude contrary evidence.
• Include citations that acknowledge and give credit to sources relied upon for this
• Are the citations up to date, referencing that latest work on this topic?
• It is the job of the authors to verify the accuracy of the references.
• Avoid: spurious citations (citations that are not needed but are included anyway);

biased citations (references added or omitted for reasons other than meeting the above goals of citations); excessive self-cites (citations to one’s own work). 

• << Previous: DISCUSSION
• Next: Bibliography of guides to scientific writing and presenting >>
• Last Updated: Aug 4, 2023 9:33 AM
• URL: https://guides.lib.uci.edu/scientificwriting

Off-campus? Please use the Software VPN and choose the group UCIFull to access licensed content. For more information, please Click here

Software VPN is not available for guests, so they may not have access to some content when connecting from off-campus.

Compiled by Timothy T. Allen , revised 2000. This paper greatly expands upon a handout originally prepared by an unknown author for distribution to students in introductory earth science courses at Dartmouth College. The work is presented here without copyright, although acknowledgement is (of course) appreciated. This document is also available in in Adobe Acrobat Format

Introduction

It is important to properly and appropriately cite references in scientific research papers in order to acknowledge your sources and give credit where credit is due. Science moves forward only by building upon the work of others. There are, however, other reasons for citing references in scientific research papers. Citations to appropriate sources show that you've done your homework and are aware of the background and context into which your work fits, and they help lend validity to your arguments. Reference citations also provide avenues for interested readers to follow up on aspects of your work -- they help weave the web of science. You may wish to include citations for sources that add relevant information to your own work, or that present alternate views. The reference citation style described here is a version of the "Author, Date" scientific style, adapted from Hansen (1991) and the Council of Biology Editors (1994). Harnack & Kleppinger (2000) have adapted "CBE style" to cite and document online sources . When to Cite References in Scientific Research Papers You should acknowledge a source any time (and every time) you use a fact or an idea that you obtained from that source. Thus, clearly, you need to cite sources for all direct quotations. But you also need to cite sources from which you paraphrase or summarize facts or ideas -- whether you've put the fact or idea into your own words or not, you got the fact or idea from somebody else and you need to give them proper acknowledgement (even if an idea might be considered "common knowledge," but you didn't know it until you found it in a particular source).

If you have more than one source by the same author published in the same year, distinguish them both in the in-text citation and in the reference list, by appending the letters a, b, c... to the year, in the order in which the different references appear in your paper. (For example: Allen 1996a, 1996b.)

If your source of information has no individual identifiable author, use the name of the organization to which the work can be attributed in place of the author's name:

For internet sources without any identifiable author or date, simply use the URL address as the in-text citation:

As New England is located at the convergence of several distinct storm tracks ( http://www.mountwashington.org/mtw_mtn.htm ), we expect to find clear differences in isotopic composition among seasons and potentially among different rain storm events (Fig. 1).

Such a source would be omitted from your References Cited or Bibliography section.

References Cited (in this document)

Council of Biology Editors, 1994, Scientific style and format: the CBE manual for authors, editors, and publishers, 6th edition, Cambridge University Press, New York. 825 p.

Harnack, A., and Kleppinger, E., 2000, Online! A reference guide to using internet sources , Bedford/St. Martin's, http://www.bedfordstmartins.com/online/index.html (August 1, 2000).

Have a language expert improve your writing

Run a free plagiarism check in 10 minutes, automatically generate references for free.

• Knowledge Base
• Referencing

A Quick Guide to Referencing | Cite Your Sources Correctly

Referencing means acknowledging the sources you have used in your writing. Including references helps you support your claims and ensures that you avoid plagiarism .

There are many referencing styles, but they usually consist of two things:

• A citation wherever you refer to a source in your text.
• A reference list or bibliography at the end listing full details of all your sources.

The most common method of referencing in UK universities is Harvard style , which uses author-date citations in the text. Our free Harvard Reference Generator automatically creates accurate references in this style.

Instantly correct all language mistakes in your text

Be assured that you'll submit flawless writing. Upload your document to correct all your mistakes.

Table of contents

Referencing styles, citing your sources with in-text citations, creating your reference list or bibliography, harvard referencing examples, frequently asked questions about referencing.

Each referencing style has different rules for presenting source information. For in-text citations, some use footnotes or endnotes , while others include the author’s surname and date of publication in brackets in the text.

The reference list or bibliography is presented differently in each style, with different rules for things like capitalisation, italics, and quotation marks in references.

Your university will usually tell you which referencing style to use; they may even have their own unique style. Always follow your university’s guidelines, and ask your tutor if you are unsure. The most common styles are summarised below.

Harvard referencing, the most commonly used style at UK universities, uses author–date in-text citations corresponding to an alphabetical bibliography or reference list at the end.

Harvard Referencing Guide

Vancouver referencing, used in biomedicine and other sciences, uses reference numbers in the text corresponding to a numbered reference list at the end.

Vancouver Referencing Guide

APA referencing, used in the social and behavioural sciences, uses author–date in-text citations corresponding to an alphabetical reference list at the end.

APA Referencing Guide APA Reference Generator

MHRA referencing, used in the humanities, uses footnotes in the text with source information, in addition to an alphabetised bibliography at the end.

MHRA Referencing Guide

OSCOLA referencing, used in law, uses footnotes in the text with source information, and an alphabetical bibliography at the end in longer texts.

OSCOLA Referencing Guide

Prevent plagiarism, run a free check.

In-text citations should be used whenever you quote, paraphrase, or refer to information from a source (e.g. a book, article, image, website, or video).

Quoting and paraphrasing

Quoting is when you directly copy some text from a source and enclose it in quotation marks to indicate that it is not your own writing.

Paraphrasing is when you rephrase the original source into your own words. In this case, you don’t use quotation marks, but you still need to include a citation.

In most referencing styles, page numbers are included when you’re quoting or paraphrasing a particular passage. If you are referring to the text as a whole, no page number is needed.

In-text citations

In-text citations are quick references to your sources. In Harvard referencing, you use the author’s surname and the date of publication in brackets.

Up to three authors are included in a Harvard in-text citation. If the source has more than three authors, include the first author followed by ‘ et al. ‘

The point of these citations is to direct your reader to the alphabetised reference list, where you give full information about each source. For example, to find the source cited above, the reader would look under ‘J’ in your reference list to find the title and publication details of the source.

Placement of in-text citations

In-text citations should be placed directly after the quotation or information they refer to, usually before a comma or full stop. If a sentence is supported by multiple sources, you can combine them in one set of brackets, separated by a semicolon.

If you mention the author’s name in the text already, you don’t include it in the citation, and you can place the citation immediately after the name.

• Another researcher warns that the results of this method are ‘inconsistent’ (Singh, 2018, p. 13) .
• Previous research has frequently illustrated the pitfalls of this method (Singh, 2018; Jones, 2016) .
• Singh (2018, p. 13) warns that the results of this method are ‘inconsistent’.

The terms ‘bibliography’ and ‘reference list’ are sometimes used interchangeably. Both refer to a list that contains full information on all the sources cited in your text. Sometimes ‘bibliography’ is used to mean a more extensive list, also containing sources that you consulted but did not cite in the text.

A reference list or bibliography is usually mandatory, since in-text citations typically don’t provide full source information. For styles that already include full source information in footnotes (e.g. OSCOLA and Chicago Style ), the bibliography is optional, although your university may still require you to include one.

Format of the reference list

Reference lists are usually alphabetised by authors’ last names. Each entry in the list appears on a new line, and a hanging indent is applied if an entry extends onto multiple lines.

Different source information is included for different source types. Each style provides detailed guidelines for exactly what information should be included and how it should be presented.

Below are some examples of reference list entries for common source types in Harvard style.

• Chapter of a book
• Journal article

Your university should tell you which referencing style to follow. If you’re unsure, check with a supervisor. Commonly used styles include:

• Harvard referencing , the most commonly used style in UK universities.
• MHRA , used in humanities subjects.
• APA , used in the social sciences.
• Vancouver , used in biomedicine.
• OSCOLA , used in law.

Your university may have its own referencing style guide.

If you are allowed to choose which style to follow, we recommend Harvard referencing, as it is a straightforward and widely used style.

References should be included in your text whenever you use words, ideas, or information from a source. A source can be anything from a book or journal article to a website or YouTube video.

If you don’t acknowledge your sources, you can get in trouble for plagiarism .

To avoid plagiarism , always include a reference when you use words, ideas or information from a source. This shows that you are not trying to pass the work of others off as your own.

You must also properly quote or paraphrase the source. If you’re not sure whether you’ve done this correctly, you can use the Scribbr Plagiarism Checker to find and correct any mistakes.

Harvard referencing uses an author–date system. Sources are cited by the author’s last name and the publication year in brackets. Each Harvard in-text citation corresponds to an entry in the alphabetised reference list at the end of the paper.

Vancouver referencing uses a numerical system. Sources are cited by a number in parentheses or superscript. Each number corresponds to a full reference at the end of the paper.

Is this article helpful?

Other students also liked.

• A Quick Guide to Harvard Referencing | Citation Examples
• APA Referencing (7th Ed.) Quick Guide | In-text Citations & References

How to Avoid Plagiarism | Tips on Citing Sources

More interesting articles.

• A Quick Guide to OSCOLA Referencing | Rules & Examples
• Harvard In-Text Citation | A Complete Guide & Examples
• Harvard Referencing for Journal Articles | Templates & Examples
• Harvard Style Bibliography | Format & Examples
• MHRA Referencing | A Quick Guide & Citation Examples
• Reference a Website in Harvard Style | Templates & Examples
• Referencing Books in Harvard Style | Templates & Examples
• Vancouver Referencing | A Quick Guide & Reference Examples

Scribbr APA Citation Checker

An innovative new tool that checks your APA citations with AI software. Say goodbye to inaccurate citations!

Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

Reference List: Textual Sources

Welcome to the Purdue OWL

This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.

Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

Basic Format for Books

Edited book, no author, edited book with an author or authors, a translation.

Note : When you cite a republished work, like the one above, in your text, it should appear with both dates: Plato (385-378/1989)

Edition Other Than the First

Article or chapter in an edited book.

Note : When you list the pages of the chapter or essay in parentheses after the book title, use "pp." before the numbers: (pp. 1-21). This abbreviation, however, does not appear before the page numbers in periodical references, except for newspapers. List any edition number in the same set of parentheses as the page numbers, separated by a comma: (2nd ed., pp. 66-72).

Multivolume Work

Articles in periodicals.

APA style dictates that authors are named with their last name followed by their initials; publication year goes between parentheses, followed by a period. The title of the article is in sentence-case, meaning only the first word and proper nouns in the title are capitalized. The periodical title is run in title case, and is followed by the volume number which, with the title, is also italicized. If a DOI has been assigned to the article that you are using, you should include this after the page numbers for the article. If no DOI has been assigned and you are accessing the periodical online, use the URL of the website from which you are retrieving the periodical.

Article in Print Journal

Note: APA 7 advises writers to include a DOI (if available), even when using the print source. The example above assumes no DOI is available.

Article in Electronic Journal

Note :  This content also appears on Reference List: Online Media .

As noted above, when citing an article in an electronic journal, include a DOI if one is associated with the article.

DOIs may not always be available. In these cases, use a URL. Many academic journals provide stable URLs that function similarly to DOIs. These are preferable to ordinary URLs copied and pasted from the browser's address bar.

Article in a Magazine

Article in a newspaper.

University Libraries

• Research Guides
• Blackboard Learn
• Interlibrary Loan
• Study Rooms
• University of Arkansas

Science Fair Resources

Citing your sources.

• The Scientific Method
• Books in Our Collection
• Online Encyclopedias
• General Science Journals
• Other Helpful Resources
• Find Articles
• Poster Techniques
• Community Borrower Privileges This link opens in a new window
• Fayetteville Public Library

When you use ideas that are not your own, it is important to credit or cite the author(s) or source, even if you do not quote their idea or words exactly as written. Citing your sources allows your reader to identify the works you have consulted and to understand the scope of your research. There are many different citation styles available. You may be required to use a particular style or you may choose one.

One of the commonly used styles is the APA (American Psychological Association) Style.

APA style stipulates that authors use brief references in the text of a work with full bibliographic details supplied in a Reference List (typically at the end of your document). In text, the reference is very brief and usually consists simply of the author's last name and a date.For example:

...Sheep milk has been proved to contain more nutrients than cow milk (Johnson, 2005).

In a Reference list, the reference contains full bibliographic details written in a format that depends on the type of reference. Examples of formats for some common types of references are listed below. For additional information, visit the University of Arkansas libraries webpage on citing your sources . Another useful web-site on this topic is here.

Author last name, Author First Initial. Author Second Initial. (Publication Year). Title of article. Title of Journal, volume(issue) (if issue numbered), pages.

Bass, M. A., Enochs, W. K., & DiBrezzo, R. (2002). Comparison of two exercise programs on general well-being of college students. Psychological Reports, 91(3), 1195-1201.

Author Last Name, Author First Initial. Author Second Initial. (if there is no author move entry title to first position) (Publication year). Title of article or entry. In Work title. (Vol. number, pp. pages). Place: Publisher.

"Ivory-billed woodpecker." (2002). In The new encyclopædia britannica. (Vol. 5, p. ). 15th ed. Chicago: Encyclopædia Britannica.

Author Last Name, Author First Initial. Author Second Initial. (if there is no author move entry title to first position) (Publication year). Title of article or entry. In Work title. Retrieved from (database name or URL).

Ivory-billed woodpecker. (2006). In Encyclopædia britannica online. Retrieved from http://search.eb.com/eb/article-9043081

Author last name, Author First Initial. Author Second Initial. (Publication Year, Month Day). Title of article. Title of Magazine,volume, pages.

Holloway, M. (2005, August). When extinct isn't. Scientific American, 293, 22-23.

Author last name, Author First Initial. Author Second Initial. (Publication Year, Month Day). Title of article. Title of Magazine. volume, pages. Retrieved from (database name or URL).

Holloway, M. (2005, August). When extinct isn't. Scientific American, 293, 22-23. Retrieved from Academic Search Premier database.

Page Author Last Name, Page Author First Initial. Page Author Second Initial. Page title [nature of work - web site, blog, forum posting, etc.]. (Publication Year). Retrieved from (URL)

Sabo, G., et al. Rock art in Arkansas [Web site]. (2001). Retrieved from http://arkarcheology.uark.edu/rockart/index.html

• << Previous: Find Articles
• Next: Poster Techniques >>
• Last Updated: Apr 23, 2024 3:13 PM
• URL: https://uark.libguides.com/sciencefair
• See us on Instagram
• Follow us on Twitter
• Phone: 479-575-4104

• TutorHome |
• IntranetHome |
• Contact the OU Contact the OU Contact the OU |
• Accessibility Accessibility
• StudentHome
• Help Centre

You are here

Help and support.

• Referencing and plagiarism

Quick guide to Harvard referencing (Cite Them Right)

• Site Accessibility: Library Services

Print this page

There are different versions of the Harvard referencing style. This guide is a quick introduction to the commonly-used Cite Them Right version. You will find further guidance available through the OU Library on the Cite Them Right Database .

For help and support with referencing and the full Cite Them Right guide, have a look at the Library’s page on referencing and plagiarism . If you need guidance referencing OU module material you can check out which sections of Cite Them Right are recommended when referencing physical and online module material .

This guide does not apply to OU Law undergraduate students . If you are studying a module beginning with W1xx, W2xx or W3xx, you should refer to the Quick guide to Cite Them Right referencing for Law modules .

Table of contents

In-text citations and full references.

• Secondary referencing
• Page numbers
• Citing multiple sources published in the same year by the same author

Full reference examples

Referencing consists of two elements:

• in-text citations, which are inserted in the body of your text and are included in the word count. An in-text citation gives the author(s) and publication date of a source you are referring to. If the publication date is not given, the phrase 'no date' is used instead of a date. If using direct quotations or you refer to a specific section in the source you also need the page number/s if available, or paragraph number for web pages.
• full references, which are given in alphabetical order in reference list at the end of your work and are not included in the word count. Full references give full bibliographical information for all the sources you have referred to in the body of your text.

To see a reference list and intext citations check out this example assignment on Cite Them Right .

Difference between reference list and bibliography

a reference list only includes sources you have referred to in the body of your text

a bibliography includes sources you have referred to in the body of your text AND sources that were part of your background reading that you did not use in your assignment

Back to top

Examples of in-text citations

You need to include an in-text citation wherever you quote or paraphrase from a source. An in-text citation consists of the last name of the author(s), the year of publication, and a page number if relevant. There are a number of ways of incorporating in-text citations into your work - some examples are provided below. Alternatively you can see examples of setting out in-text citations in Cite Them Right .

Note: When referencing a chapter of an edited book, your in-text citation should give the author(s) of the chapter.

Online module materials

(Includes written online module activities, audio-visual material such as online tutorials, recordings or videos).

When referencing material from module websites, the date of publication is the year you started studying the module.

Surname, Initial. (Year of publication/presentation) 'Title of item'. Module code: Module title . Available at: URL of VLE (Accessed: date).

OR, if there is no named author:

The Open University (Year of publication/presentation) 'Title of item'. Module code: Module title . Available at: URL of VLE (Accessed: date).

Rietdorf, K. and Bootman, M. (2022) 'Topic 3: Rare diseases'. S290: Investigating human health and disease . Available at: https://learn2.open.ac.uk/mod/oucontent/view.php?id=1967195 (Accessed: 24 January 2023).

The Open University (2022) ‘3.1 The purposes of childhood and youth research’. EK313: Issues in research with children and young people . Available at: https://learn2.open.ac.uk/mod/oucontent/view.php?id=1949633&section=1.3 (Accessed: 24 January 2023).

You can also use this template to reference videos and audio that are hosted on your module website:

The Open University (2022) ‘Video 2.7 An example of a Frith-Happé animation’. SK298: Brain, mind and mental health . Available at: https://learn2.open.ac.uk/mod/oucontent/view.php?id=2013014&section=4.9.6 (Accessed: 22 November 2022).

The Open University (2022) ‘Audio 2 Interview with Richard Sorabji (Part 2)’. A113: Revolutions . Available at: https://learn2.open.ac.uk/mod/oucontent/view.php?id=1960941&section=5.6 (Accessed: 22 November 2022).

Note: if a complete journal article has been uploaded to a module website, or if you have seen an article referred to on the website and then accessed the original version, reference the original journal article, and do not mention the module materials. If only an extract from an article is included in your module materials that you want to reference, you should use secondary referencing, with the module materials as the 'cited in' source, as described above.

Surname, Initial. (Year of publication) 'Title of message', Title of discussion board , in Module code: Module title . Available at: URL of VLE (Accessed: date).

Fitzpatrick, M. (2022) ‘A215 - presentation of TMAs', Tutor group discussion & Workbook activities , in A215: Creative writing . Available at: https://learn2.open.ac.uk/mod/forumng/discuss.php?d=4209566 (Accessed: 24 January 2022).

Note: When an ebook looks like a printed book, with publication details and pagination, reference as a printed book.

Surname, Initial. (Year of publication) Title . Edition if later than first. Place of publication: publisher. Series and volume number if relevant.

For ebooks that do not contain print publication details

Surname, Initial. (Year of publication) Title of book . Available at: DOI or URL (Accessed: date).

Example with one author:

Bell, J. (2014) Doing your research project . Maidenhead: Open University Press.

Adams, D. (1979) The hitchhiker's guide to the galaxy . Available at: http://www.amazon.co.uk/kindle-ebooks (Accessed: 23 June 2021).

Example with two or three authors:

Goddard, J. and Barrett, S. (2015) The health needs of young people leaving care . Norwich: University of East Anglia, School of Social Work and Psychosocial Studies.

Example with four or more authors:

Young, H.D. et al. (2015) Sears and Zemansky's university physics . San Francisco, CA: Addison-Wesley.

Note: You can choose one or other method to reference four or more authors (unless your School requires you to name all authors in your reference list) and your approach should be consistent.

Note: Books that have an editor, or editors, where each chapter is written by a different author or authors.

Surname of chapter author, Initial. (Year of publication) 'Title of chapter or section', in Initial. Surname of book editor (ed.) Title of book . Place of publication: publisher, Page reference.

Franklin, A.W. (2012) 'Management of the problem', in S.M. Smith (ed.) The maltreatment of children . Lancaster: MTP, pp. 83–95.

Surname, Initial. (Year of publication) 'Title of article', Title of Journal , volume number (issue number), page reference.

If accessed online:

Surname, Initial. (Year of publication) 'Title of article', Title of Journal , volume number (issue number), page reference. Available at: DOI or URL (if required) (Accessed: date).

Shirazi, T. (2010) 'Successful teaching placements in secondary schools: achieving QTS practical handbooks', European Journal of Teacher Education , 33(3), pp. 323–326.

Shirazi, T. (2010) 'Successful teaching placements in secondary schools: achieving QTS practical handbooks', European Journal of Teacher Education , 33(3), pp. 323–326. Available at: https://libezproxy.open.ac.uk/login?url=https://search.ebscohost.com/log... (Accessed: 27 January 2023).

Barke, M. and Mowl, G. (2016) 'Málaga – a failed resort of the early twentieth century?', Journal of Tourism History , 2(3), pp. 187–212. Available at: https://doi.org/10.1080/1755182X.2010.523145

Surname, Initial. (Year of publication) 'Title of article', Title of Newspaper , Day and month, Page reference.

Surname, Initial. (Year of publication) 'Title of article', Title of Newspaper , Day and month, Page reference if available. Available at: URL (Accessed: date).

Mansell, W. and Bloom, A. (2012) ‘£10,000 carrot to tempt physics experts’, The Guardian , 20 June, p. 5.

Roberts, D. and Ackerman, S. (2013) 'US draft resolution allows Obama 90 days for military action against Syria', The Guardian , 4 September. Available at: http://www.theguardian.com/world/2013/sep/04/syria-strikes-draft-resolut... (Accessed: 9 September 2015).

Surname, Initial. (Year that the site was published/last updated) Title of web page . Available at: URL (Accessed: date).

Organisation (Year that the page was last updated) Title of web page . Available at: URL (Accessed: date).

Robinson, J. (2007) Social variation across the UK . Available at: https://www.bl.uk/british-accents-and-dialects/articles/social-variation... (Accessed: 21 November 2021).

The British Psychological Society (2018) Code of Ethics and Conduct . Available at: https://www.bps.org.uk/news-and-policy/bps-code-ethics-and-conduct (Accessed: 22 March 2019).

Note: Cite Them Right Online offers guidance for referencing webpages that do not include authors' names and dates. However, be extra vigilant about the suitability of such webpages.

Surname, Initial. (Year) Title of photograph . Available at: URL (Accessed: date).

Kitton, J. (2013) Golden sunset . Available at: https://www.jameskittophotography.co.uk/photo_8692150.html (Accessed: 21 November 2021).

stanitsa_dance (2021) Cossack dance ensemble . Available at: https://www.instagram.com/p/COI_slphWJ_/ (Accessed: 13 June 2023).

Note: If no title can be found then replace it with a short description.

• Frequently Asked Questions
• Getting started with the online library
• Disabled user support
• Finding resources for your assignment
• Finding ejournals and articles
• Access eresources using Google Scholar
• Help with online resources
• Finding and using books and theses
• Finding information on your research topic
• Canllaw Cyflym i Gyfeirnodi Harvard (Cite Them Right)
• Quick guide to Cite Them Right referencing for Law modules
• The Classical Studies guide to referencing
• Bibliographic management
• What if I cannot find the reference type I need in my referencing guide?
• I have found a web page with no author, date or publisher - how do I reference it?
• Training and skills
• Study materials
• Using other libraries and SCONUL Access
• Borrowing at the Walton Hall Library
• OU Glossary
• Contacting the helpdesk

Smarter searching with library databases

Thursday, 9 May, 2024 - 20:30

Learn how to access library databases, take advantage of the functionality they offer, and devise a proper search technique.

Library Helpdesk

Chat to a Librarian  - Available 24/7

Other ways to contact the Library Helpdesk

The Open University

• Study with us
• Supported distance learning
• Funding your studies
• International students
• Global reputation
• Apprenticeships
• Develop your workforce
• News & media
• Contact the OU

Undergraduate

• Arts and Humanities
• Art History
• Business and Management
• Combined Studies
• Computing and IT
• Counselling
• Creative Writing
• Criminology
• Early Years
• Electronic Engineering
• Engineering
• Environment
• Film and Media
• Health and Social Care
• Health and Wellbeing
• Health Sciences
• International Studies
• Mathematics
• Mental Health
• Nursing and Healthcare
• Religious Studies
• Social Sciences
• Social Work
• Software Engineering
• Sport and Fitness

Postgraduate

• Postgraduate study
• Research degrees
• Masters in Art History (MA)
• Masters in Computing (MSc)
• Masters in Creative Writing (MA)
• Masters degree in Education
• Masters in Engineering (MSc)
• Masters in English Literature (MA)
• Masters in History (MA)
• Master of Laws (LLM)
• Masters in Mathematics (MSc)
• Masters in Psychology (MSc)
• A to Z of Masters degrees
• Accessibility statement
• Conditions of use
• Privacy policy
• Cookie policy
• Manage cookie preferences
• Modern slavery act (pdf 149kb)

Follow us on Social media

• Student Policies and Regulations
• Student Charter
• System Status
• Contact the OU Contact the OU
• Modern Slavery Act (pdf 149kb)

© . . .

Scientific Style (CSE) Citation Examples

• Books/eBooks
• Conferences/unpublished
• Ask a Librarian
• Authors in parentheses
• Author(s) in sentence
• Multiple/Stacked references
• Multiple works by same author
• Organization as author

One author:  ( Smith 2018)  

Two authors: authors’ last names are separated by “and” followed by the year.

EXAMPLE: (Rieseberg and Soltis 1991)  

Three or more authors: list only the first author’s last name, followed by “et al.” and the year.

EXAMPLE: (Tsutsui et al. 2009)  

If different authors have the same surname (last name), add their initials

. . .but later studies (Mardis KL and Mardis LA 2012) established that. . .

• Cite sources  as close as possible  to the information they support.
• Put an in-text citation for an entire sentence  right  before the period.

Using multiple in-text references at the same point

Provide in chronologic sequence from earliest to latest, separated by semicolons - sequence by month those published in same year or, if this information isn't available, alphabetically by author names

. . .the main proponents (Mardis and Johnson 1972; Mardis and Wyatt 1972; Baudino F 1978; Baudino K 1978; Park et al. 1980; Ury et al. 1981; Zupa 1985) concluded that. . .

Example in a ScienceDirect article:

http://www.sciencedirect.com/science/article/pii/S1055790316300914

Multiple works by the same author(s) in different years

Jackson's studies of the AIDS virus (1985, 1986) have shown that. . .

Organization as author:  (American Dietetic Association 2016)

No author?  

(Human Biology . . . 2002-2016). Use date range if website lists a range of dates rather than a single year.

(Organizations . . . 2016).

• << Previous: References
• Next: Ask a Librarian >>
• Last Updated: Dec 19, 2023 4:09 PM
• URL: https://libguides.nwmissouri.edu/cse

BibGuru Blog

Be more productive in school

• Citation Styles

What citation style to use for science [Updated 2023]

What citation style should you use for a science paper? In this post, we explore the most frequently used citation styles for science. We cover APA, IEEE, ACS, and others and provide examples of each style.

APA (American Psychological Association) style is a citation format used in the social sciences, education, and engineering, as well as in the sciences. APA consists of two elements: in-text citations and a reference list.

It uses an author-date system, in which the author’s last name and year of publication are put in parentheses (e.g. Smith 2003). These parenthetical citations refer the reader to a list at the end of the paper, which includes information about each source.

APA style resources

🌐 Official APA style guidelines

🗂 APA style guide

📝 APA citation generator

APA style examples

Here is an example of an in-text citation in APA style:

In recent years, much debate has been stirred regarding volcanic soil (Avşar et al., 2018) .

Here is a bibliography entry in APA style:

Avşar, E., Ulusay, R., Aydan, Ö., & Mutlutürk, M . ( 2015 ). On the Difficulties of Geotechnical Sampling and practical Estimates of the Strength of a weakly bonded Volcanic Soil . Bulletin of Engineering Geology and the Environment , 74 ( 4 ), 1375–1394 . https://doi.org/10.1007/s10064-014-0710-9

Chicago style is another form of citation used for science papers and journals. It has two formats: a notes and bibliography system and an author-date system.

The notes and bibliography system is mostly used for the humanities, whereas the author-date system is used in science and business. The latter uses in-text citations formed by the author's last name and date of publication. A bibliography at the end of the paper lists the full information for all references.

Chicago style resources

🌐 Official Chicago style guidelines

🗂 Chicago style guide

📝 Chicago citation generator

Chicago style examples

Here is an in-text citation in Chicago style:

However, a research proved this theory right (Hofman and Rick 2018, 65-115) .

Here is a bibliography entry in Chicago style:

Hofman, Courtney A., and Torben C. Rick . “ Ancient Biological Invasions and Island Ecosystems: Tracking Translocations of Wild Plants and Animals .” Journal of Archaeological Research 26 , no. 1 ( 2018 ): 65–115 . doi.org/10.1007/s10814-017-9105-3 .

CSE style is the standard format used in the physical and life sciences. This style features three types of citation systems: citation-sequence, name-year, and citation-name.

• Name-Year : In-text citations of this type feature the author’s last name and the year of publication in brackets. A bibliography at the end lists all references in full.

• Citation-Sequence : Every source is assigned a superscript number that is used as an in-text reference. The bibliography at the end lists all numbers with their references in the order in which they appeared in the text.

• Citation-Name : The reference list is organized alphabetically by authors’ last names; each name is assigned a number which can be placed in superscript as an in-text reference.

CSE style resources

🌐 Official CSE style guidelines

📝 CSE citation generator

CSE style examples

Here is an example of an in-text citation in CSE name-year style:

Therefore, the translocation of wild plants was tracked (Hofman and Rick 2018) .

Here is a bibliography entry in CSE name-year style:

Hofman CA, Rick TC. 2018. Ancient Biological Invasions and Island Ecosystems: Tracking Translocations of Wild Plants and Animals. J. Archaeol. [accessed 2019 Mar 11]; 26(1): 65–11. doi.org/10.1007/s10814-017-9105-3.

AIP style, as its title suggests, is commonly applied in physics and astronomy papers. This style has a numbered citation system , which uses superscript numbers to show in-text citations. These numbers correspond to a list of sources at the end of the paper.

AIP style resources

🌐 Official AIP style guidelines

🗂 AIP style guide

📝 AIP citation generator

AIP style examples

Here is an in-text citation in AIP style:

A similar study was carried out in 2015 ¹ .

Here is a bibliography entry in AIP style:

¹ H.D. Young and R.A. Freedman, Sears & Zemansky's University Physics (Addison-Wesley, San Francisco, CA, 2015) p. 160

ACS style is the standard citation style for chemistry. This style uses both numeric and author-date citations systems. The numbered in-text citations can have either a superscript number or a number in italics. Full references for each source are listed at the end of the paper.

ACS style resources

🌐 Official ACS style guidelines

🗂 ACS style guide

📝 ACS citation generator

ACS style examples

Here is an in-text citation in ACS author-date style:

The opposing side was given first (Brown et al., 2017) .

Here is a bibliography entry in ACS author-date style:

Brown, T.E.; LeMay H.E.; Bursten, B.E.; Murphy, C.; Woodward, P.; Stoltzfus M.E. Chemistry: The Central Science in SI Units . Pearson: New York, 2017.

IEEE style is used for engineering and science papers. This style uses a numeric, in-text citation format, with a number in square brackets. This number corresponds to a reference list entry at the end of the paper.

IEEE style resources

🌐 Official IEEE style guidelines

🗂 IEEE style guide

📝 IEEE citation generator

IEEE style examples

Here is an example of an in-text citation in IEEE style:

As seen in a multi-camera study [1] ...

Here is a bibliography entry in IEEE style:

[1] E. Nuger and B. Benhabib, “Multi-Camera Active-Vision for Markerless Shape Recovery of Unknown Deforming Objects,” J. Intell. Rob. Syst. , vol. 92, no. 2, pp. 223–264, Oct. 2018.

Frequently Asked Questions about citation styles used in science

The most frequently used citation style in the sciences is APA (American Psychological Association) style.

There are two major types of citation systems you can use: author-date or numeric. Numeric citation styles tend to be preferred for science disciplines.

Yes, you have to add a bibliography or reference list citing all sources mentioned in your scientific paper.

Some of the most popular scientific journals are: Science Magazine , Nature , and The Lancet .

Title pages for science papers must follow the format of the citation style that you’re using. For example, in APA style you need to include a title, running head, a name, and other details. Visit our guide on title pages to learn more.

Make your life easier with our productivity and writing resources.

For students and teachers.

Help | Advanced Search

Computer Science > Computer Vision and Pattern Recognition

Title: multi-cell decoder and mutual learning for table structure and character recognition.

Abstract: Extracting table contents from documents such as scientific papers and financial reports and converting them into a format that can be processed by large language models is an important task in knowledge information processing. End-to-end approaches, which recognize not only table structure but also cell contents, achieved performance comparable to state-of-the-art models using external character recognition systems, and have potential for further improvements. In addition, these models can now recognize long tables with hundreds of cells by introducing local attention. However, the models recognize table structure in one direction from the header to the footer, and cell content recognition is performed independently for each cell, so there is no opportunity to retrieve useful information from the neighbor cells. In this paper, we propose a multi-cell content decoder and bidirectional mutual learning mechanism to improve the end-to-end approach. The effectiveness is demonstrated on two large datasets, and the experimental results show comparable performance to state-of-the-art models, even for long tables with large numbers of cells.

Submission history

Access paper:.

• HTML (experimental)
• Other Formats

References & Citations

• Google Scholar
• Semantic Scholar

BibTeX formatted citation

Bibliographic and Citation Tools

Code, data and media associated with this article, recommenders and search tools.

• Institution

arXivLabs: experimental projects with community collaborators

arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website.

Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them.

Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs .