how to get citations for a research paper

Evaluating Scholarly Publications for Tenure and Promotion: How to find Citations to an Article

• Introduction
• How to find the SCImago Factor
• How to Find Impact Factors for Journals
• How to Find Eignefactors
• How to find Citations to an Article
• How to find your h-index
• Qualitative Measures
• Creative Activity
• Potential Risks

How do I Find Citations to a Journal Article?

More and more databases are tracking citations now. Check the database that you normally use to find articles for your research. If you have questions about whether a particular database includes citation counts, ask a librarian for help and we can help you determine if your favorite database has what you need.

Below are listed several databases that do include citation counts that you can use as examples. The first, the citation databases (science, social science, and humanities) are all included in the Web of Science and are a good starting point for all fields. Next come Google Scholar and SocIndex.

Web of Science

From the library's website ( http://www.sdstate.edu/library ), click Databases A-Z, and search for "Web of Science."

Select Cited Reference Search, and follow the on-screen tips and examples to complete your search.

Fill out as many fields as you feel necessary to find the article you want to find citations to.

From the list of results, you can see the number of times your article has been cited in the Web of Science, you can look at more information for a particular article, or you can choose several articles from the list.

If you click on View Record, you can see who has cited the article and create an alert that will send you an e-mail every time another citation to your articl is added to Web of Science.

Google Scholar

Google Scholar counts the number of times it finds citations to a particular article; however, there are some reasons to be cautious in using the Google Scholar citations. First, Google Scholar does not evaluate the publications it indexes in any way. Other indexes use some sort of criteria to determine what they index so there is some quality control within the index. Google scholar does have some criteria but they are not quality control type criteria. The number may not be an accurate reflection of the number of individual publications that cite your work either.

For instance, if an article cites your work and the citing article is written by 6 people. After a few months (assuming those 6 authors were researching using federal grants), the article can be put on their individual web pages so each of those 6 people put the article on their web page and the journal makes the article available in some way that Google finds it on the journal web site as well. Google Scholar will count 7 citations to your work even though only 1 article cited it.

With those caveats, Google will pick up citations that other indexes don't so it is a good index to use for citation counts if you are careful.

Go to http://google.scholar.com .

If you have a Google account, you can log into it and Google will make searching for your citations very easy.

Fill out your profile.

Choose the articles you have written from the list that is discoverd for authors with your name. (This is an instance where you should be grateful if your parents gave you an unusual name.)

Once you have chosen yourself as an author and added the articles Google identified as yours, you will be able to follow those articles.

Search Google Scholar for a particular article

You can search Google Scholar for a particular article as well. In the search box type the title of the article (you can use quotation marks around the title to make Google search it as a phrase but this is often unnecessary).

Find the article in the results list and the citations to it will be at the botom of the citation.

(Note that this is the same article as the example in the Web of Science instructions, WOS has 185 citations, Google lists 237. Once you have checked for unique citations, you can list both numbers.)

Articles Indexed in PubMed & NIH-funded Research

Relative Citation Ratio (RCR)  and Field Citation Ratio (FCR)   These metrics compare a given paper to others in the same research area or field. The papers need to be at least two years old.  Dimensions database : Search this app to find RCR and FCR   at https://app.dimensions.ai/discover/publication . 

Examples: Results in Dimensions for two papers

1. A highly-cited paper in a journal with Impact factor of 5.76 

2. A paper with below-average ctiations in a journal with impact factor of 5.36

While the IFs are not very different, the publications' impacts are quite different!

Our thanks to Dr. Sen Subramanian for supplying these links and examples.

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• Next: How to find your h-index >>
• Last Updated: Sep 1, 2023 3:00 PM
• URL: https://libguides.sdstate.edu/ScholarlyResearchEvidence

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.

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Citation Basics

Harvard Referencing

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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

APA Style 7th Edition: Citing Your Sources

Apa 7th edition, what is the purpose, quick links.

• In Text Quick View
• Block Quotes
• Books & eBooks
• Thesis/Dissertation
• Audiovisual
• Conference Presentations
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• Legal References
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• Academic Integrity and Plagiarism
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• Reference Page

APA Publications in the Library

This guide pertains to the 7th edition of the APA Manual.

This guide is designed to support the citation and reference needs of USC students, staff, and faculty.  The 7th edition of the manual does make distinctions between formatting certain components for academic use over publication.  This guide will distinguish student/academic formatting where applicable. 

This guide is designed as a "quick" reference to common APA citation, reference and formatting criteria.  When in doubt, we encourage users to consult with the APA publication manual or APA website for further clarification as the authority on formatting.

Attribution for guide: Adapted from American Psychological Association. (2020). Publication manual of the American Psychological Association (7th ed).  https://doi.org/10.1037/0000165-000

What is the purpose of citations?

Citations help readers locate your sources. They help to continue the scholarly conversation. To learn more about how citations can help you avoid plagiarism, view this interactive tutorial: 

USC Library Lessons: Avoiding Plagiarism through Citations

When considering citations and references for your papers, you can ask yourself, "could someone find this information in the future?"

A client's personal file would not need a citation because your reader cannot go find that information again.  Census statistics would require a citation because your reader could go locate that information again.

APA requires FOUR ELEMENTS of every citation:

• Who- Author of content
• When- Date content was published
• What- Title of content
• Where- Publication information. This can be the website you got it from or the journal or book's publication information.

If any of the elements listed above are unavailable, check out "Missing Reference Information" from APA for more information.

• APA Style Website As part of our Style and Grammar Guidelines, we explain the basics of paper format, grammar, punctuation, in-text citations, references, bias-free language, and more. Much of what you used to find on the sixth edition blog, you can now find on the APA Style website.
• Organizing Your Social Sciences Research Paper by Robert V. Labaree Last Updated May 6, 2024 623241 views this year
• Owl Purdue 7th Edition Style Guide and Formatting Writing guide from Owl Purdue covering the 7th edition of the APA Manual
• Quick Reference Guide Quick guide on how to identify components to configure a reference for Journal article, book, and chapter from an edited book.
• Annotated Sample Student Paper Sample student paper with formatting annotations.
• Sample student paper
• Annotated Sample Professional Paper Sample professional paper with formatting annotations
• Sample professional paper
• USC Libraries APA Style Quick Guide
• Next: In Text Citations >>
• Last Updated: Apr 22, 2024 9:37 AM
• URL: https://libguides.usc.edu/APA7th

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• When should I use a citation?
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• Which citation style should I use?
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• Citing Sources

Citing Sources: What are citations and why should I use them?

What is a citation.

Citations are a way of giving credit when certain material in your work came from another source. It also gives your readers the information necessary to find that source again-- it provides an important roadmap to your research process. Whenever you use sources such as books, journals or websites in your research, you must give credit to the original author by citing the source. 

Why do researchers cite?

Scholarship is a conversation  and scholars use citations not only to  give credit  to original creators and thinkers, but also to  add strength and authority  to their own work.  By citing their sources, scholars are  placing their work in a specific context  to show where they “fit” within the larger conversation.  Citations are also a great way to  leave a trail  intended to help others who may want to explore the conversation or use the sources in their own work.

In short, citations

(1) give credit

(2) add strength and authority to your work

(3) place your work in a specific context

(4) leave a trail for other scholars

"Good citations should reveal your sources, not conceal them. They should honeslty reflect the research you conducted." (Lipson 4)

Lipson, Charles. "Why Cite?"  Cite Right: A Quick Guide to Citation Styles--MLA, APA, Chicago, the Sciences, Professions, and More . Chicago: U of Chicago, 2006. Print.

What does a citation look like?

Different subject disciplines call for citation information to be written in very specific order, capitalization, and punctuation. There are therefore many different style formats. Three popular citation formats are MLA Style (for humanities articles) and APA or Chicago (for social sciences articles).

MLA style (print journal article):  

Whisenant, Warren A. "How Women Have Fared as Interscholastic Athletic Administrators Since the Passage of Title IX." Sex Roles Vol. 49.3 (2003): 179-182.

APA style (print journal article):

Whisenant, W. A. (2003) How Women Have Fared as Interscholastic Athletic Administrators Since the Passage of Title IX. Sex Roles , 49 (3), 179-182.

Chicago style (print journal article):

Whisenant, Warren A. "How Women Have Fared as Interscholastic Athletic Administrators Since the Passage of Title IX." Sex Roles 49, no. 3 (2003): 179-182.

No matter which style you use, all citations require the same basic information:

• Author or Creator
• Container (e.g., Journal or magazine, website, edited book)
• Date of creation or publication
• Publisher 

You are most likely to have easy access to all of your citation information when you find it in the first place. Take note of this information up front, and it will be much easier to cite it effectively later.

• << Previous: Basics of Citing
• Next: When should I use a citation? >>
• Last Updated: May 1, 2024 12:48 PM
• URL: https://guides.lib.uw.edu/research/citations

Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

In-Text Citations: The Basics

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.

Note:  This page reflects the latest version of the APA Publication Manual (i.e., APA 7), which released in October 2019. The equivalent resource for the older APA 6 style  can be found here .

Reference citations in text are covered on pages 261-268 of the Publication Manual. What follows are some general guidelines for referring to the works of others in your essay.

Note:  On pages 117-118, the Publication Manual suggests that authors of research papers should use the past tense or present perfect tense for signal phrases that occur in the literature review and procedure descriptions (for example, Jones (1998)  found  or Jones (1998)  has found ...). Contexts other than traditionally-structured research writing may permit the simple present tense (for example, Jones (1998)  finds ).

APA Citation Basics

When using APA format, follow the author-date method of in-text citation. This means that the author's last name and the year of publication for the source should appear in the text, like, for example, (Jones, 1998). One complete reference for each source should appear in the reference list at the end of the paper.

If you are referring to an idea from another work but  NOT  directly quoting the material, or making reference to an entire book, article or other work, you only have to make reference to the author and year of publication and not the page number in your in-text reference.

On the other hand, if you are directly quoting or borrowing from another work, you should include the page number at the end of the parenthetical citation. Use the abbreviation “p.” (for one page) or “pp.” (for multiple pages) before listing the page number(s). Use an en dash for page ranges. For example, you might write (Jones, 1998, p. 199) or (Jones, 1998, pp. 199–201). This information is reiterated below.

Regardless of how they are referenced, all sources that are cited in the text must appear in the reference list at the end of the paper.

In-text citation capitalization, quotes, and italics/underlining

• Always capitalize proper nouns, including author names and initials: D. Jones.
• If you refer to the title of a source within your paper, capitalize all words that are four letters long or greater within the title of a source:  Permanence and Change . Exceptions apply to short words that are verbs, nouns, pronouns, adjectives, and adverbs:  Writing New Media ,  There Is Nothing Left to Lose .

( Note:  in your References list, only the first word of a title will be capitalized:  Writing new media .)

• When capitalizing titles, capitalize both words in a hyphenated compound word:  Natural-Born Cyborgs .
• Capitalize the first word after a dash or colon: "Defining Film Rhetoric: The Case of Hitchcock's  Vertigo ."
• If the title of the work is italicized in your reference list, italicize it and use title case capitalization in the text:  The Closing of the American Mind ;  The Wizard of Oz ;  Friends .
• If the title of the work is not italicized in your reference list, use double quotation marks and title case capitalization (even though the reference list uses sentence case): "Multimedia Narration: Constructing Possible Worlds;" "The One Where Chandler Can't Cry."

Short quotations

If you are directly quoting from a work, you will need to include the author, year of publication, and page number for the reference (preceded by "p." for a single page and “pp.” for a span of multiple pages, with the page numbers separated by an en dash).

You can introduce the quotation with a signal phrase that includes the author's last name followed by the date of publication in parentheses.

If you do not include the author’s name in the text of the sentence, place the author's last name, the year of publication, and the page number in parentheses after the quotation.

Long quotations

Place direct quotations that are 40 words or longer in a free-standing block of typewritten lines and omit quotation marks. Start the quotation on a new line, indented 1/2 inch from the left margin, i.e., in the same place you would begin a new paragraph. Type the entire quotation on the new margin, and indent the first line of any subsequent paragraph within the quotation 1/2 inch from the new margin. Maintain double-spacing throughout, but do not add an extra blank line before or after it. The parenthetical citation should come after the closing punctuation mark.

Because block quotation formatting is difficult for us to replicate in the OWL's content management system, we have simply provided a screenshot of a generic example below.

Formatting example for block quotations in APA 7 style.

Quotations from sources without pages

Direct quotations from sources that do not contain pages should not reference a page number. Instead, you may reference another logical identifying element: a paragraph, a chapter number, a section number, a table number, or something else. Older works (like religious texts) can also incorporate special location identifiers like verse numbers. In short: pick a substitute for page numbers that makes sense for your source.

Summary or paraphrase

If you are paraphrasing an idea from another work, you only have to make reference to the author and year of publication in your in-text reference and may omit the page numbers. APA guidelines, however, do encourage including a page range for a summary or paraphrase when it will help the reader find the information in a longer work. 

Referencing Generator

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What Is Cite This For Me’s Reference Generator?

Cite This For Me’s open-access generator is an automated citation machine that turns any of your sources into references in just a click. Using a reference generator helps students to integrate referencing into their research and writing routine; turning a time-consuming ordeal into a simple task.

A referencing generator accesses information from across the web, drawing the relevant information into a fully-formatted bibliography that clearly presents all of the sources that have contributed to your work.

If you don’t know how to reference a website correctly, or have a fast-approaching deadline, Cite This For Me’s accurate and intuitive reference generator will lend you the confidence to realise your full academic potential. In order to get a grade that reflects all your hard work, your references must be accurate and complete. Using a citation machine not only saves you time but also ensures that you don’t lose valuable marks on your assignment.

Not sure how to format your citations, what citations are, or just want to find out more about Cite This For Me’s reference generator? This guide outlines everything you need to know to equip yourself with the know-how and confidence to research and cite a wide range of diverse sources in your work.

Why Do I Need To Reference?

Simply put, when another source contributes to your work, you have to give the original owner the appropriate credit. After all, you wouldn’t steal someone else’s possessions so why would you steal their ideas?

Regardless of whether you are referencing a website, an article or a podcast, any factual material or ideas you take from another source must be acknowledged in a citation unless it is common knowledge (e.g. Winston Churchill was English). Failing to credit all of your sources, even when you’ve paraphrased or completely reworded the information, is plagiarism. Plagiarising will result in disciplinary action, which can range from losing precious marks on your assignment to expulsion from your university.

What’s more, attributing your research infuses credibility and authority into your work, both by supporting your own ideas and by demonstrating the breadth of your research. For many students, crediting sources can be a confusing and tedious process, but it’s a surefire way to improve the quality of your work so it’s essential to get it right. Luckily for you, using Cite This For Me’s reference generator makes creating accurate references easier than ever, leaving more time for you to excel in your studies.

In summary, the citing process serves three main functions:

• To validate the statements and conclusions in your work by providing directions to other sound sources that support and verify them.
• To help your readers locate, read and check your sources, as well as establishing their contribution to your work.
• To give credit to the original author and hence avoid committing intellectual property theft (known as ‘plagiarism’ in academia).

How Do I Cite My Sources With The Cite This For Me Referencing Generator?

Cite This For Me’s reference generator is the most accurate citation machine available, so whether you’re not sure how to format in-text references or are looking for a foolproof solution to automate a fully-formatted bibliography, this referencing generator will solve all of your citing needs.

Crediting your source material doesn’t just prevent you from losing valuable marks for plagiarism, it also provides all of the information to help your reader find for themselves the book, article, or other item you are citing. The accessible interface of the reference generator makes it easy for you to identify the source you have used – simply enter its unique identifier into the citation machine search bar. If this information is not available you can search for the title or author instead, and then select from the search results that appear below the reference generator.

Don’t know how to reference a website? The good news is that by using tools such as Cite This For Me’s reference generator, which help you work smarter, you don’t need to limit your research to sources that are traditional to cite. In fact, there are no limits to what you can cite, whether you are referencing a website, a YouTube video or a tweet.

To use the reference generator, simply:

• Select your style from Harvard, APA, OSCOLA and many more*
• Choose the type of source you would like to cite (e.g. website, book, journal, video)
• Enter the URL , DOI , ISBN , title, or other unique source information to find your source
• Click the ‘Cite’ button on the reference generator
• Copy your new citation straight from the referencing generator into your bibliography
• Repeat for each source that has contributed to your work.

*If you require another style for your paper, essay or other academic work, you can select from over 1,000 styles by creating a free Cite This For Me account.

Once you have created your Cite This For Me account you will be able to use the reference generator to create multiple references and save them into a project. Use Cite This For Me’s highly-rated iOS or Android apps to generate references in a flash with your smartphone camera, export your complete bibliography in one go, and much more.

What Will The Reference Generator Create For Me?

Cite This For Me’s reference generator will create your citation in two parts: an in-text citation and a full citation to be copied straight into your work.

The reference generator will auto-generate the correct formatting for your bibliography depending on your chosen style. For instance, if you select a parenthetical style the reference generator will generate an in-text citation in parentheses, along with a full citation to slot into your bibliography. Likewise, if the reference generator is set to a footnote style then it will create a fully-formatted citation for your reference list and bibliography, as well as a corresponding footnote to insert at the bottom of the page containing the relevant source.

Parenthetical style examples:

In-text example: A nation has been defined as an imagined community (Anderson, 2006).* Alternative format: Anderson (2006) defined a nation as an imagined community.

*The reference generator will create your references in the first style, but this should be edited if the author’s name already appears in the text.

Bibliography / Works Cited list example: Anderson, B. (2006). Imagined Communities. London: Verso.

What Are Citation Styles?

A citation style is a set of rules that you, as an academic writer, must follow to ensure the quality and relevance of your work. There are thousands of styles that are used in different academic institutions around the world, but in the UK the most common are Harvard, APA and Oscola.

The style you need to use will depend on the preference of your lecturer, discipline or academic institution – so if you’re unsure which style you should be using, consult your department and follow their guidelines exactly, as this is what you’ll be evaluated on when it comes to marking. You can also find your university’s style by logging into your Cite This For Me account and setting your institution in ‘My Profile’.

Citing isn’t just there to guard against plagiarism – presenting your research in a clear and consistent way eases the reader’s comprehension. Each style has a different set of rules for formatting both the page and your references. Be sure to adhere to formatting rules such as font type, font size and line spacing to ensure that your work is easily legible. Furthermore, if your work is published as part of an anthology or collected works, each entry will need to be presented in the same style to maintain uniformity throughout. It is important to make sure that you don’t jump from one style to another, so follow the rules carefully to ensure your reference list and bibliography are both accurate and complete.

If you need a hand with your citations then why not try Cite This For Me’s reference generator? It’s the quickest and easiest way to cite any source, in any style. The reference generator above will create your citations in the Harvard referencing style as standard, but it can generate fully-formatted references in over 1,000 styles – including university variations of each style. So, whether your lecturer has asked you to adopt APA referencing , or your subject requires you to use OSCOLA referencing , we’re sure to have the style you need. To access all of them, simply go to Cite This For Me’s website to create your free Cite This For Me account and search for your specific style such as MLA or Vancouver .

How Do I Format A Reference List Or Bibliography?

Drawing on a wide range of sources greatly enhances the quality of your work, and reading above and beyond your recommended reading list – and then using these sources to support your own thesis – is an excellent way to impress your reader. A clearly presented reference list or bibliography demonstrates the lengths you have gone to in researching your chosen topic.

Typically, a reference list starts on a new page at the end of the main body of text and includes a complete list of the sources you have actually cited in your paper. This list should contain all the information needed for the reader to locate the original source of the information, quote or statistic that directly contributed to your work. On the other hand, a bibliography is a comprehensive list of all the material you may have consulted throughout your research and writing process. Both provide the necessary information for readers to retrieve and check the sources cited in your work.

Each style’s guidelines will define the terminology of ‘reference list’ and ‘bibliography’, as well as providing formatting guidelines for font, line spacing and page indentations. In addition, it will instruct you on how to order each list – this will usually be either alphabetical or chronological (meaning the order that these sources appear in your work). Before submitting your work, be sure to check that you have formatted your whole paper according to your style’s formatting guidelines.

Sounds complicated? Citing has never been so easy; Cite This For Me’s reference generator will automatically generate fully-formatted citations for your reference list or bibliography in your chosen style. Sign in to your Cite This For Me account to save and export your bibliography.

How Do References Actually Work?

Although the reference generator will create your bibliography for you in record time, it is still useful to understand how this system works behind the scenes. As well as saving you time with its referencing generator, Cite This For Me provides the learning resources to help you fully understand the citing process and the benefits of adopting great citing standards.

The referencing process:

• Find a book, journal, website or other source that will contribute to your work
• Save the quote, image, data or other information that you will use in your work
• Save the source information that enables you to find it again (i.e. URL, ISBN, DOI etc.)
• Format the source information into a citation
• Copy and paste the citation into the body of the text
• Repeat for each source that contributes to your work.
• Export or copy and paste the fully-formatted citation into your bibliography.

Manage all your references in one place

Create projects, add notes, cite directly from the browser and scan books’ barcodes with a mobile app.

Sign up to Cite This For Me – the ultimate reference management tool.

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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 414,207 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

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Write and Cite

• Citing Sources
• Academic Integrity

When to Cite

• Citation Styles

Citation Style Guides and Resources

• Fair Use, Permissions, and Copyright
• Writing Resources
• From Research to Writing
• Grants and Fellowships

Reasons for citing sources are based on academic, professional, and cultural values. At the GSD, we cite to promote

• Integrity and honesty by acknowledging the creative and intellectual work of others.
• The pursuit of knowledge by enabling others to locate the materials you used.
• The development of design excellence through research into scholarly conversations related to your subject.

Cite your source whenever you quote, summarize, paraphrase, or otherwise include someone else's

• Words 
• Opinions, thoughts, interpretations, or arguments
• Original research, designs, images, video, etc.

How to Cite 

Citations follow different rules for structure and content depending on which style you use. At the GSD, mostly you will use Chicago or APA style. Often you can choose the style you prefer, but it's good to ask your professor or TA/TF. Whichever style you use, be consistent. We recommend using Zotero , a citation-management tool, to structure your citations for you, but you should always check to make sure the tool captures the correct information in the correct place.

• Chicago Style

 Chicago Style 

Citing print sources.

Footnote - long (first time citing the source)

1. Joseph Rykwert, The Idea of a Town: The Anthropology of Urban Form in Rome, Italy and the Ancient World , (New Jersey: Princeton University Press, 1976), 35.

Footnote - short (citing the source again)

1. Rykwert, The Idea of a Town , 35.

In-text citation (alternative to footnotes)

(Rykwert 1976, 35)

Bibliography (alphabetical order and hanging indentation)

Rykwert, Joseph. The Idea of a Town: the Anthropology of Urban Form in Rome, Italy and the Ancient World . New Jersey: Princeton University Press, 1976.

Chapter 

1. Diane Favro, “The Street Triumphant: The Urban Impact of Roman Triumphal Parades,” in Streets: Critical Perspectives on Public Space , ed. Zeynep Çelik , Diana Favro, and Richard Ingersoll (Berkeley: University of California Press,1994), 153.

1. Favro, “The Street Triumphant,” 156.

In-text citation (called "author-date," an alternative to footnotes)

(Favro 1994, 153)

Bibliography  (alphabetical order and hanging indentation)

Favro, Diane. “The Street Triumphant: The Urban Impact of Roman Triumphal Parades.” In Streets: Critical Perspectives on Public Space, edited by Zeynep Çelik, Diane G. Favro, and Richard Ingersoll, 151-164. Berkeley: University of California Press, 1994.

Journal Article 

1. Hendrik Dey, “From ‘Street’ to ‘Piazza’: Urban Politics, Public Ceremony, and the Redefinition of platea in Communal Italy and Beyond” Speculum 91, no.4 (October 2016): 919.

1. Dey, “From ‘Street’ to ‘Piazza,’” 932.

Dey, Hendrik. “From ‘Street’ to ‘Piazza’: Urban Politics, Public Ceremony, and the Redefinition of platea in Communal Italy and Beyond.” Speculum 91, no.4 (October 2016): 919-44.

Citing Visual Sources 

Visual representations created by other people, including photographs, maps, drawings, models, graphs, tables, and blueprints, must be cited.  Citations for visual material may be included at the end of a caption or in a list of figures, similar to but usually separate from the main bibliography.

When they are not merely background design, images are labeled as figures and numbered. In-text references to them refer to the figure number. Sometimes you will have a title after the figure number and a brief descriptive caption below it. 

If you choose to include the citation under the caption, format it like a footnote entry. If you would prefer to have a list of figures for citation information, organize them by figure number and use the format of a bibliographic entry. 

The construction of citations for artwork and illustrations is more flexible and variable than textual sources. Here we have provided an example with full bibliographic information. Use your best judgment and remember that the goals are to be consistent and to provide enough information to credit your source and for someone else to find your source.

Some borrowed material in collages may also need to be cited, but the rules are vague and hard to find. Check with your professor about course standards. 

Citing Generative AI

The rules for citing the use of generative AI, both textual and visual, are still evolving. For guidelines on when to cite the use of AI, please refer to the section on Academic Integrity. Here, we will give you suggestions for  how to cite based on what the style guides say and what Harvard University encourages. We again recommend that you to ask your instructors about their expectations for use and citation and to remain consistent in your formatting.

The Chicago Manual of Style currently states that "for most types of writing, you can simply acknowledge the AI tool in your text" with a parenthetical comment stating the use of a specific tool. For example: (Image generated by Midjourney). 

For academic papers or research articles, you should have a numbered footnote or endnote

Footnote - prompt not included in the text of the paper

1. ChatGPT, response to "Suggest three possible responses from community stakeholders to the proposed multi-use development project," OpenAI, March 28, 2024, https://chat.openai.com/chat.

Footnote - prompt included in the text of the paper

1. Text generated by ChatGPT, OpenAI, March 28, 2024, https://chat.oenai.com/chat

Footnote - edited AI-generated text

1. Text generated by ChatGPT, OpenAI, March 28, 2024, edited for clarity, https://chat.oenai.com/chat

In-text citation  (called "author-date," an alternative to footnotes)

(Text generated by ChatGPT, OpenAI) or (Text generated by ChatGPT, OpenAI, edited for clarity)

Chicago does not encourage including generative AI in a bibliography unless the tool also generates a direct link to the same generated content.

https://www-chicagomanualofstyle-org.ezp-prod1.hul.harvard.edu/qanda/data/faq/topics/Documentation/faq0422.html

 APA Style 

In-text citation  

(Rykwert 1976 p. 35)

Footnote  (for supplemental information)

1. From  The idea of a town: The anthropology of urban form in Rome, Italy and the ancient world by Joseph  Rykwert, 1976, New Jersey:  Princeton University Press.

Bibliography/Reference  (alphabetical order and hanging indentation)

Rykwert, J. (1976).  The idea of a town: The anthropology of urban form in Rome, Italy and the ancient world .  Princeton University Press.

In-Text Citation

(Favro   1994 p.153)

Footnote (for supplemental information)

1. From the chapter "The street triumphant: The urban impact of Roman triumphal parades" in  Streets: Critical perspectives on public space,  edited by Zeynep Çelik , Diana Favro, and Richard Ingersoll, 1994, Berkeley: University of California Press.

Favro, D. (1994) “The street triumphant: The Urban Impact of Roman Triumphal Parades.” In Zeynep Çelik, Diane G. Favro, and Richard Ingersoll (Eds.),  Streets: Critical Perspectives on Public Space ( pp.151-164). University of California Press.

(Dey 2016 p.919)

Footnote  (for supplemental material)

1. From the article “From ‘street’ to ‘Piazza’: Urban politics, public ceremony, and the Redefinition of platea in Communal Italy and Beyond” by  Hendrik Dey in   Speculum 91(4), 919.  www.journals.uchicago.edu/toc/spc/2016/91/4

Dey, H. (2016). From "street" to "piazza": Urban politics, public ceremony, and the redefinition of platea in communal Italy and beyond.  Speculum 91 (4), 919-44. www.journals.uchicago.edu/toc/spc/2016/91/4

Visual representations created by other people, including photographs, maps, drawings, models, graphs, tables, and blueprints, must be cited. In APA style, tables are their own category, and all other visual representations are considered figures. Tables and figures both follow the same basic setup. 

When they are not merely background design, images are labeled as figures and numbered and titled above the image. If needed to clarify the meaning or significance of the figure, a note may be placed below it. In-text references to visual sources refer to the figure number (ex. As shown in Figure 1..."). 

Citations for visual material created by other people may either be included under the figure or note or compiled in a list of figures, similar to but usually separate from the main bibliography.

Figures may take up a whole page or be placed at the top or bottom of the page with a blank double-space below or above it.

If you choose to include the citation under the figure, format it like a bibliographic entry. If you would prefer to have a list of figures for citation information, organize them by figure number and use the format of a bibliographic entry. Here is a detailed example. Some figures will require less bibliographic information, but it is a good practice to include as much as you can.

The construction of citations for artwork and illustrations is more flexible and variable than for textual sources. Here we have provided an example with full bibliographic information. Use your best judgment and remember that the goals are to be consistent and to provide enough information to credit your source and for someone else to find your source.

The APA style team currently says to "describe how you used the tool in your Methods section or in a comparable section of your paper," perhaps the introduction for literature reviews and response papers. In your paper, state the prompt followed by the resulting generated text. Cite generative AI use according to the rules you would use for citing an algorithm. Include the URL if it leads directly to the same generated material; otherwise, the URL is optional.

(OpenAI, 2024) 

Footnote   (for supplemental material)

APA does not yet provide a structure or example for a footnote. If you need to mention generative AI in a footnote, stay as consistent with formatting as possible.

OpenAI. (2024). ChatGPT (Mar 14 version) [Large language model]. https://chat.openai.com/chat

These links take you to external resources for further research on citation styles.

• Chicago Manual of Style 17th Edition Online access to the full manual through Hollis with a quick guide, Q&A, video tutorials, and more.
• CMOS Shop Talk: How Do I Format a List of Figures? A brief description of how to format a list of figures with an attached sample document.
• Documenting and Citing Images in Chicago A Research guide from USC with nice examples of images with citations.
• Harvard Guide to Citing Sources A guide from Harvard Libraries on citing sources in Chicago style.
• A Manual for Writers of Research Papers, Theses, and Dissertations: Chicago Style for Students and Researchers A Chicago manual specifically for students with clear and detailed information about citing for papers rather than publications.
• Chicago Manual of Style Q&A Citing Generative Artificial Intelligence
• APA Style Common Reference Examples A list of sample references organized by type.
• APA Style Manual 7th Edition Online access to the full APA Style Manual (scanned) through Hollis.
• APA Style Sample Papers Links to sample papers that model how to create citations in APA.
• Formatting Checklist This page is a quick guide to all kinds of formatting, from the title page to the bibliography, with links to more detailed instructions.
• Harvard Guide to Citing Sources A guide from Harvard Libraries on citing sources in APA style.
• Journal Article References This page contains reference examples for journal articles.
• In-Text Citations in APA Style A place to learn more about rules for citing sources in your text.
• Tables and Figures This page leads to explanations about how to format tables and figures as well as examples of both.
• How to Cite ChatGPT Here are the APA's current rules for citing generative AI and ChatGPT in particular.
• MetaLAB AI Code of Conduct A proposed code of conduct generated by a collaborative of Harvard faculty and students.
• << Previous: Academic Integrity
• Next: Fair Use, Permissions, and Copyright >>
• Last Updated: May 7, 2024 1:43 PM
• URL: https://guides.library.harvard.edu/gsd/write

Harvard University Digital Accessibility Policy

Cited Reference Search

Search for records that have cited a published work, and discover how a known idea or innovation has been confirmed, applied, improved, extended, or corrected. Find out who’s citing your research and the impact your work is having on other researchers in the world.

In the Arts & Humanities Citation Index, you can use cited reference search to find articles that refer to or include an illustration of a work of art or a music score; these references are called implicit citations .

• You may also search on Cited Year(s), Cited Volume, Cited Issue, Cited Pages, Cited Title, or Cited DOI
• Click Search; results from the cited reference index that include the work you’re searching appears on a table. Every reference on the cited reference index has been cited by at least one article indexed in the Web of Science. The first author of a cited work always displays in the Cited Author column. If the cited author you specified in step 1 is not the primary author, then the name of author you specified follows the name of the first author (click Show all authors). If you retrieve too many hits, return to the cited reference search page and add criteria for Cited Year, Cited Volume, Cited Issue, or Cited Page.
• cited reference is not a source article in the Web of Science
• reference may contain incomplete or inaccurate information, and can’t be linked to a source article
• reference may refer to a document from a publication outside the timespan of your subscription; for example, if the article was published in 1992, but your subscription only gives you access to 20 years of data
• cited item may refer to a document from a publication not covered by a database in your subscription
• Click Search to view your results.

Click View abbreviation list to see the abbreviations of journal and conference proceedings titles used as cited works; this list will open in a new browser tab.

When you complete a cited reference search, the number of citing items you retrieve may be smaller than the number listed in the Citing Articles column if your institution's subscription does not include all years of the database. In other words, the count in the Citing Articles column is not limited by your institution's subscription. However, your access to records in the product is limited by your institution's subscription.

• Enter the name of the first author of a multi-authored article or book
• Enter an abbreviated journal title followed by an asterisk or the first one or two significant words of a book title followed by an asterisk.
• Try searching for the cited reference without entering a cited year in order to retrieve variations of the same cited reference. You can always return to the Cited Reference Search page and enter a cited year if you get too many references.
• When searching for biblical references, enter Bible in the Cited Author field and the name of the book ( Corinthinans* , Matthew* Leviticus *, etc.) in the Cited Work field. Ensure that you use the asterisk (*) wildcard in your search.

Follow these steps to find articles that have cited Brown, M.E. and Calvin, W.M. Evidence for crystalline water and ammonia ices on Pluto's satellite Charon. Science . 287 (5450): 107-109. January 7, 2000:

• On the Cited Reference Search page, enter Brown M* in the Cited Author field.
• Enter Science* in the Cited Work field.
• Click Search to go to the Cited Reference Search table. This page shows all the results from the Web of Science cited reference index that matched the query.
• Page through the results to find this reference:

• Select the check box to the left of the reference.
• Click the See Results button to go to the Cited Reference Search Results page to see the list of articles that cite the article by Brown and Calvin.

Every cited reference in the Cited Reference Index contains enough information to uniquely identify the document. Because only essential bibliographic information is captured, and because author names and source publication titles are unified as much as possible, the same reference cited in two different records should appear the same way in the database. This unification is what makes possible the Times Cited number on the Full Record page.

However, not all references to the same publication can be unified. As a consequence, a cited reference may have variations in the product.

For example, consider these variations of a reference to an article by A.J. Bard published in volume 374 of Nature:

The first reference contains the correct volume number and other bibliographic information. The View Record link takes you to the Full Record, which has a Times Cited count of 31.

The second reference contains a different volume number and it does not have a View Record link. Because a journal cannot have two different volume numbers in the same publication year, it is obvious that this is an incorrect reference to the same article.

Click Export at the top of the Cited Reference Search table to export the cited reference search results to Excel.

Articles indexed in the Science Citation Index Expanded cite books, patents, and other types of publications in addition to other articles. You can do a cited reference search for a patent to find journal articles that have cited it.

If you know the patent number, enter it in the Cited Work field. If you do not know the patent number, try entering the name of the first listed inventor or patent assignee in the Cited Author field. For example, to find references to U.S. patent 4096196-A, enter 4096196 in the Cited Work field. If you also subscribe to Derwent Innovations Index and the patent is included in the Derwent database, the patents you find in the citation index will be linked to the corresponding full patent records in Derwent Innovations Index.

Self-citations refer to cited references that contain an author name that matches the name of the author of a citing article.

You may want to eliminate self-citations from the results of a Cited Reference Search by combining a Cited Reference Search with a search by the source author.

• Perform a Cited Reference Search to find items that cite the works of a particular author. Ensure that you complete both steps of a Cited Reference Search.
• Go to the search page. Enter the name of the same author in the Author field. Click the Search button.
• Go to the advanced search page.
• Combine the two searches you just completed in a Boolean NOT expression (for example, #1 NOT #2 ). The results of the Search (the items written by the author) should be the set on the right-hand side of the operator.

Articles indexed in the product cite books, patents, and other types of publications in addition to other articles. You can do a cited reference search on a book to find journal articles that have cited it.

You should identify a book by entering the name of the first listed author in the Cited Author field and the first word or words of the title in the Cited Work field. Many cited works are abbreviated. If you are not sure how a word has been spelled or abbreviated, enter the first few letters of the word, followed by an asterisk. For example, to search for records of articles that cite Edith Hamilton's book Mythology , you would enter Hamilton E* in the Cited Author field and Myth* in the Cited Work field.

Do not enter a year in the Cited Year field. Authors often cite a particular edition of a book, and the cited year is the year of the edition they are citing. Generally, you want to find all articles that cite a book, regardless of the particular edition cited.

For example, enter the following data on the Cited Reference Search page, and then click Search .

CITED AUTHOR Tuchman BW

CITED WORK Guns*

CITED YEAR 1962

Note the number of references that are retrieved. Now repeat the search using the following data:

CITED AUTHOR Tuchman B*

See how many more references you retrieved? Notice that the author has been cited as Tuchman B as well as Tuchman BW. Also, notice how many different cited years and cited page numbers there are for the same work.

10 Easy Ways to Increase Your Citation Count: a Checklist

• Research Process
• Peer Review

To boost your citation count to maximize impact, consider these 10 simple techniques.

Updated on October 18, 2019

The number of papers you publish is important to your career. “Publish early and often” is heard over and over again in research. However, the number of times your work is cited is important as well because it can indicate the impact that your research has on the field.

Increasing your citation count can also have a positive impact on your career because funding agencies often look at a combination of the number of papers and the number of citations when making grant decisions.

To boost your citation count to maximize impact, consider these 10 simple techniques:

1. Cite your past work when it is relevant to a new manuscript. However, do not reference every paper you have written just to increase your citation count.

2. Carefully choose your keywords. Choose keywords that researchers in your field will be searching for so that your paper will appear in a database search.

3. Use your keywords and phrases in your title and repeatedly in your abstract. Repeating keywords and phrases will increase the likelihood your paper will be at the top of a search engine list, making it more likely to be read.

4. Use a consistent form of your name on all of your papers. Using the same name on all of your papers will make it easier for others to find all of your published work. If your name is very common, consider getting a research identifier, such as an ORCID . You can provide your ORCID in your email signature and link that ID to your publication list so that anyone you email has access to your publications.

5. Make sure that your information is correct. Check that your name and affiliation are correct on the final proofs of your manuscript and check that the paper's information is accurate in database searches.

6. Make your manuscript easily accessible. If your paper is not published in an open-access journal, post your pre- or post-publication prints to a repository . Check SHERPA RoMEO to find your publisher's copyright and self-archiving policies regarding sharing your published manuscript.

7. Share your data. There is some evidence that sharing your data can increase your citations . Consider posting to data sharing websites, such as figshare or SlideShare , or contributing to Wikipedia and providing links to your published manuscripts.

8. Present your work at conferences. Although conference presentations are not cited by other others, this will make your research more visible to the academic and research communities. Check out these tips for making the most of your next research conference .

9. Use social media. Provide links to your papers on social media (e.g., Facebook , Twitter , Academia.edu , ResearchGate , Mendeley ) and your university profile page.

10. Actively promote your work. Talk to other researchers about your paper, even ones not in your field, and email copies of your paper to researchers who may be interested. Create a blog or a website dedicated to your research and share it.

Additional reading:

• http://researchsupporthub.northampton.ac.uk/2013/02/05/2429/
• http://www.jobs.ac.uk/careers-advice/working-in-higher-education/2172/how-to-increase-your-citation-rates-in-10-easy-steps-part-2/
• http://mpra.ub.uni-muenchen.de/50919/

Michelle Ebbs, PhD

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How To Do In-Text Citations with Multiple Authors in APA Format

APA (or American Psychological Association) Style   was introduced in 1929 to establish a consistent style guide for scientific writing. It sought to make scientific works easier to read and understand. However, the style guidelines have expanded to include many disciplines, such as the humanities and health care.

The APA’s Publication Manual does not cover the general writing style rules in other editorial style guides, such as the MLA Handbook . APA Style seeks to create uniformity of common writing styles relevant to behavior and social sciences primarily.

Consistent formatting allows the reader to engage with the presented ideas rather than be distracted by the author’s personal formatting preferences. It also helps readers quickly review the document for references and sources to aid their research. Using APA Style keeps authors transparent by providing rules about citing their sources and giving credit for others’ ideas.

How to do in-text citations in APA

• Understanding “et. al.” usage in APA

Citing multiple authors in APA

• In-text citations for various author types in APA

Best practices and common mistakes

APA Style allows writers to credit and cite other works appropriately and avoid plagiarism through in-text citations. APA Style uses the author–date citation system, which requires notations to be included within the document to reference ideas, paraphrases and quotations from other bodies of work. Each in-text citation within the paper (or chart, footnote or figure) briefly identifies the cited work and guides the reader to a longer list of cited sources at the end of the document, called the reference list.

In-text citations can be written within a paper parenthetically or narratively. Both include the same information: the author’s last name and the publication date.

• Parenthetical citation : Great falls can be caused by sitting on tall walls (Dumpty, 1797).
• Narrative citation : Dumpty (1797) claims that great falls can be caused by sitting on tall walls.
• Reference list entry: Dumpty, Humpty (1797). Humpty Dumpty Sat on a Wall. Nursery Rhymes, 100.

APA Style requires citations to conform to a set of guidelines , which includes proper spelling of author names, consistency between the in-text citation information and its reference list entry and rules about crediting all facts and figures mentioned – especially those which are not common knowledge.

Understanding “et al.” usage in APA

Et al. is an abbreviation used to indicate multiple people. It’s the abbreviated version of “et alia,” a neutral plural version of “and others.” Most commonly, et al. indicates more than one contributor, such as multiple authors or editors, in a work.

In APA Style citations, et al. is used to indicate a cited work with three or more authors and serves as a way to condense the in-text citation to avoid confusion and unnecessary length. An APA in-text citation with three or more authors will include only the first author’s name plus “et al.” in every citation.

Citing multiple authors in APA Style is similar to MLA Style . For one or two authors, list the last name(s) followed by the year of publication. 

• One author: (Beyonce, 1997)
• Contributors: Daryl Hall and John Oates

To cite three or more authors using APA Style, use only the first author’s last name listed, plus “et al.” 

• Contributors: Earth, Wind and Fire

When two separate sources have the same abbreviated et al. form , spell out as many last names as needed to distinguish the sources from each other. It may include two last names followed by et al.

Similarly, when the first authors of separate sources share the same last name but have different initials, use their first initials in the in-text citations.

• Beyonce Knowles & Solange Knowles

In-text citation for various author types in APA

You may face a challenging situation where you must cite a group author , such as an institution or university, rather than a list of authors’ names. In this instance, you’ll list the group or organization.

• Group author: (Furman University, 2020)

If the group also has an abbreviation to its name, you may note the first and subsequent citations differently to be as concise as possible.

• Group author with abbreviation – 1st citation: (American Psychological Association [APA], 2024)
• Group author with abbreviation – 2nd citation : (APA, 2024)

The most common mistake when citing sources is forgetting to cite a source. One way to ensure you include all required sources is to document and manage your sources as you use their ideas within the document. This may mean you create the citations as you conduct your research, create your outline or type the final paper.

Some applications exist to help you manage and document citations, including EasyBib , Mendeley , EndNote and Zotero . Depending on your writing style, these applications can help you create citations, save your research sources, annotate documents and format references. 

Regarding best practices for in-text citations in APA Style, it’s good practice to proofread your citations and reference list together. When citing multiple authors, ensure all spellings are accurate and consistent throughout the document and reference list. Refer to the APA Style Publication Manual and other guideline reference documents to confirm your citing within the latest citation guidelines.

Giving credit to other authors who have shaped your research and ideas is incredibly important. You can do so without risking plagiarism accusations through in-text citations that are marked and referenced. Not only does it provide you with an honest and accurate reputation, but it also helps your readers gain more valuable knowledge from other sources.

Citing sources should not discourage you from sharing your knowledge within academic writing. Sooner or later, you’ll become a pro at in-text citations in APA style! The more you write, the more familiar you’ll become with the guidelines; you’ll no longer need to reference the style guides for help.

The perspectives and thoughts shared in the Furman Blog belong solely to the author and may not align with the official stance or policies of Furman University. All referenced sources were accurate as of the date of publication.

How To Do In-Text Citations in MLA Format: A Quick Guide for Students

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Volume 30, Number 7—July 2024

Highly Pathogenic Avian Influenza A(H5N1) Clade 2.3.4.4b Virus Infection in Domestic Dairy Cattle and Cats, United States, 2024

Suggested citation for this article

We report highly pathogenic avian influenza A(H5N1) virus in dairy cattle and cats in Kansas and Texas, United States, which reflects the continued spread of clade 2.3.4.4b viruses that entered the country in late 2021. Infected cattle experienced nonspecific illness, reduced feed intake and rumination, and an abrupt drop in milk production, but fatal systemic influenza infection developed in domestic cats fed raw (unpasteurized) colostrum and milk from affected cows. Cow-to-cow transmission appears to have occurred because infections were observed in cattle on Michigan, Idaho, and Ohio farms where avian influenza virus–infected cows were transported. Although the US Food and Drug Administration has indicated the commercial milk supply remains safe, the detection of influenza virus in unpasteurized bovine milk is a concern because of potential cross-species transmission. Continued surveillance of highly pathogenic avian influenza viruses in domestic production animals is needed to prevent cross-species and mammal-to-mammal transmission.

Highly pathogenic avian influenza (HPAI) viruses pose a threat to wild birds and poultry globally, and HPAI H5N1 viruses are of even greater concern because of their frequent spillover into mammals. In late 2021, the Eurasian strain of H5N1 (clade 2.3.4.4b) was detected in North America ( 1 , 2 ) and initiated an outbreak that continued into 2024. Spillover detections and deaths from this clade have been reported in both terrestrial and marine mammals in the United States ( 3 , 4 ). The detection of HPAI H5N1 clade 2.3.4.4b virus in severe cases of human disease in Ecuador ( 5 ) and Chile ( 6 ) raises further concerns regarding the pandemic potential of specific HPAI viruses.

In February 2024, veterinarians were alerted to a syndrome occurring in lactating dairy cattle in the panhandle region of northern Texas. Nonspecific illness accompanied by reduced feed intake and rumination and an abrupt drop in milk production developed in affected animals. The milk from most affected cows had a thickened, creamy yellow appearance similar to colostrum. On affected farms, incidence appeared to peak 4–6 days after the first animals were affected and then tapered off within 10–14 days; afterward, most animals were slowly returned to regular milking. Clinical signs were commonly reported in multiparous cows during middle to late lactation; ≈10%–15% illness and minimal death of cattle were observed on affected farms. Initial submissions of blood, urine, feces, milk, and nasal swab samples and postmortem tissues to regional diagnostic laboratories did not reveal a consistent, specific cause for reduced milk production. Milk cultures were often negative, and serum chemistry testing showed mildly increased aspartate aminotransferase, gamma-glutamyl transferase, creatinine kinase, and bilirubin values, whereas complete blood counts showed variable anemia and leukocytopenia.

In early March 2024, similar clinical cases were reported in dairy cattle in southwestern Kansas and northeastern New Mexico; deaths of wild birds and domestic cats were also observed within affected sites in the Texas panhandle. In > 1 dairy farms in Texas, deaths occurred in domestic cats fed raw colostrum and milk from sick cows that were in the hospital parlor. Antemortem clinical signs in affected cats were depressed mental state, stiff body movements, ataxia, blindness, circling, and copious oculonasal discharge. Neurologic exams of affected cats revealed the absence of menace reflexes and pupillary light responses with a weak blink response.

On March 21, 2024, milk, serum, and fresh and fixed tissue samples from cattle located in affected dairies in Texas and 2 deceased cats from an affected Texas dairy farm were received at the Iowa State University Veterinary Diagnostic Laboratory (ISUVDL; Ames, IA, USA). The next day, similar sets of samples were received from cattle located in affected dairies in Kansas. Milk and tissue samples from cattle and tissue samples from the cats tested positive for influenza A virus (IAV) by screening PCR, which was confirmed and characterized as HPAI H5N1 virus by the US Department of Agriculture National Veterinary Services Laboratory. Detection led to an initial press release by the US Department of Agriculture Animal and Plant Health Inspection Service on March 25, 2024, confirming HPAI virus in dairy cattle ( 7 ). We report the characterizations performed at the ISUVDL for HPAI H5N1 viruses infecting cattle and cats in Kansas and Texas.

Materials and Methods

Milk samples (cases 2–5) and fresh and formalin-fixed tissues (cases 1, 3–5) from dairy cattle were received at the ISUVDL from Texas on March 21 and from Kansas on March 22, 2024. The cattle exhibited nonspecific illness and reduced lactation, as described previously. The tissue samples for diagnostic testing came from 3 cows that were euthanized and 3 that died naturally; all postmortem examinations were performed on the premises of affected farms.

The bodies of 2 adult domestic shorthaired cats from a north Texas dairy farm were received at the ISUVDL for a complete postmortem examination on March 21, 2024. The cats were found dead with no apparent signs of injury and were from a resident population of ≈24 domestic cats that had been fed milk from sick cows. Clinical disease in cows on that farm was first noted on March 16; the cats became sick on March 17, and several cats died in a cluster during March 19–20. In total, >50% of the cats at that dairy became ill and died. We collected cerebrum, cerebellum, eye, lung, heart, spleen, liver, lymph node, and kidney tissue samples from the cats and placed them in 10% neutral-buffered formalin for histopathology.

At ISUVDL, we trimmed, embedded in paraffin, and processed formalin-fixed tissues from affected cattle and cats for hematoxylin/eosin staining and histologic evaluation. For immunohistochemistry (IHC), we prepared 4-µm–thick sections from paraffin-embedded tissues, placed them on Superfrost Plus slides (VWR, https://www.vwr.com ), and dried them for 20 minutes at 60°C. We used a Ventana Discovery Ultra IHC/ISH research platform (Roche, https://www.roche.com ) for deparaffinization until and including counterstaining. We obtained all products except the primary antibody from Roche. Automated deparaffination was followed by enzymatic digestion with protease 1 for 8 minutes at 37°C and endogenous peroxidase blocking. We obtained the primary influenza A virus antibody from the hybridoma cell line H16-L10–4R5 (ATCC, https://www.atcc.org ) and diluted at 1:100 in Discovery PSS diluent; we incubated sections with antibody for 32 minutes at room temperature. Next, we incubated the sections with a hapten-labeled conjugate, Discovery anti-mouse HQ, for 16 minutes at 37°C followed by a 16-minute incubation with the horse radish peroxidase conjugate, Discovery anti-HQ HRP. We used a ChromoMap DAB kit for antigen visualization, followed by counterstaining with hematoxylin and then bluing. Positive controls were sections of IAV-positive swine lung. Negative controls were sections of brain, lung, and eyes from cats not infected with IAV.

We diluted milk samples 1:3 vol/vol in phosphate buffered saline, pH 7.4 (Gibco/Thermo Fisher Scientific, https://www.thermofisher.com ) by mixing 1 unit volume of milk and 3 unit volumes of phosphate buffered saline. We prepared 10% homogenates of mammary glands, brains, lungs, spleens, and lymph nodes in Earle’s balanced salt solution (Sigma-Aldrich, https://www.sigmaaldrich.com ). Processing was not necessary for ocular fluid, rumen content, or serum samples. After processing, we extracted samples according to a National Animal Health Laboratory Network (NAHLN) protocol that had 2 NAHLN-approved deviations for ISUVDL consisting of the MagMax Viral RNA Isolation Kit for 100 µL sample volumes and a Kingfisher Flex instrument (both Thermo Fisher Scientific).

We performed real-time reverse transcription PCR (rRT-PCR) by using an NAHLN-approved assay with 1 deviation, which was the VetMAX-Gold SIV Detection kit (Thermo Fisher Scientific), to screen for the presence of IAV RNA. We tested samples along with the VetMAX XENO Internal Positive Control to monitor the possible presence of PCR inhibitors. Each rRT-PCR 96-well plate had 2 positive amplification controls, 2 negative amplification controls, 1 positive extraction control, and 1 negative extraction control. We ran the rRT-PCR on an ABI 7500 Fast thermocycler and analyzed data with Design and Analysis Software 2.7.0 (both Thermo Fisher Scientific). We considered samples with cycle threshold (Ct) values <40.0 to be positive for virus.

After the screening rRT-PCR, we analyzed IAV RNA–positive samples for the H5 subtype and H5 clade 2.3.4.4b by using the same RNA extraction and NAHLN-approved rRT-PCR protocols as described previously, according to standard operating procedures. We performed PCR on the ABI 7500 Fast thermocycler by using appropriate controls to detect H5-specific IAV. We considered samples with Ct values <40.0 to be positive for the IAV H5 subtype.

We conducted genomic sequencing of 2 milk samples from infected dairy cattle from Texas and 2 tissue samples (lung and brain) from cats that died at a different Texas dairy. We subjected the whole-genome sequencing data to bioinformatics analysis to assemble the 8 different IAV segment sequences according to previously described methods ( 8 ). We used the hemagglutinin (HA) and neuraminidase (NA) sequences for phylogenetic analysis. We obtained reference sequences for the HA and NA segments of IAV H5 clade 2.3.4.4 from publicly available databases, including GISAID ( https://www.gisaid.org ) and GenBank. We aligned the sequences by using MAFFT version 7.520 software ( https://mafft.cbrc.jp/alignment/server/index.html ) to create multiple sequence alignments for subsequent phylogenetic analysis. We used IQTree2 ( https://github.com/iqtree/iqtree2 ) to construct the phylogenetic tree from the aligned sequences. The software was configured to automatically identify the optimal substitution model by using the ModelFinder Plus option, ensuring the selection of the most suitable model for the dataset and, thereby, improving the accuracy of the reconstructed tree. We visualized the resulting phylogenetic tree by using iTOL ( https://itol.embl.de ), a web-based platform for interactive tree exploration and annotation.

Gross Lesions in Cows and Cats

All cows were in good body condition with adequate rumen fill and no external indications of disease. Postmortem examinations of the affected dairy cows revealed firm mammary glands typical of mastitis; however, mammary gland lesions were not consistent. Two cows that were acutely ill before postmortem examination had grossly normal milk and no abnormal mammary gland lesions. The gastrointestinal tract of some cows had small abomasal ulcers and shallow linear erosions of the intestines, but those observations were also not consistent in all animals. The colon contents were brown and sticky, suggesting moderate dehydration. The feces contained feed particles that appeared to have undergone minimal ruminal fermentation. The rumen contents had normal color and appearance but appeared to have undergone minimal fermentation.

The 2 adult cats (1 intact male, 1 intact female) received at the ISUVDL were in adequate body and postmortem condition. External examination was unremarkable. Mild hemorrhages were observed in the subcutaneous tissues over the dorsal skull, and multifocal meningeal hemorrhages were observed in the cerebrums of both cats. The gastrointestinal tracts were empty, and no other gross lesions were observed.

Microscopic Lesions in Cows and Cats

Figure 1 . Mammary gland lesions in cattle in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024. A, B) Mammary gland...

The chief microscopic lesion observed in affected cows was moderate acute multifocal neutrophilic mastitis ( Figure 1 ); however, mammary glands were not received from every cow. Three cows had mild neutrophilic or lymphocytic hepatitis. Because they were adult cattle, other observed microscopic lesions (e.g., mild lymphoplasmacytic interstitial nephritis and mild to moderate lymphocytic abomasitis) were presumed to be nonspecific, age-related changes. We did not observe major lesions in the other evaluated tissues. We performed IHC for IAV antigen on all evaluated tissues; the only tissues with positive immunoreactivity were mastitic mammary glands from 2 cows that showed nuclear and cytoplasmic labeling of alveolar epithelial cells and cells within lumina ( Figure 1 ) and multifocal germinal centers within a lymph node from 1 cow ( Table 1 ).

Figure 2 . Lesions in cat tissues in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024. Tissue sections were stained with...

Both cats had microscopic lesions consistent with severe systemic virus infection, including severe subacute multifocal necrotizing and lymphocytic meningoencephalitis with vasculitis and neuronal necrosis, moderate subacute multifocal necrotizing and lymphocytic interstitial pneumonia, moderate to severe subacute multifocal necrotizing and lymphohistiocytic myocarditis, and moderate subacute multifocal lymphoplasmacytic chorioretinitis with ganglion cell necrosis and attenuation of the internal plexiform and nuclear layers ( Table 2 ; Figure 2 ). We performed IHC for IAV antigen on multiple tissues (brain, eye, lung, heart, spleen, liver, and kidney). We detected positive IAV immunoreactivity in brain (intracytoplasmic, intranuclear, and axonal immunolabeling of neurons), lung, and heart, and multifocal and segmental immunoreactivity within all layers of the retina ( Figure 2 ).

PCR Data from Cows and Cats

We tested various samples from 8 clinically affected mature dairy cows by IAV screening and H5 subtype-specific PCR ( Table 3 ). Milk and mammary gland homogenates consistently showed low Ct values: 12.3–16.9 by IAV screening PCR, 17.6–23.1 by H5 subtype PCR, and 14.7–20.0 by H5 2.3.4.4 clade PCR (case 1, cow 1; case 2, cows 1 and 2; case 3, cow 1; and case 4, cow 1). We forwarded the samples to the National Veterinary Services Laboratory, which confirmed the virus was an HPAI H5N1 virus strain.

When available, we also tested tissue homogenates (e.g., lung, spleen, and lymph nodes), ocular fluid, and rumen contents from 6 cows by IAV and H5 subtype-specific PCR ( Table 3 ). However, the PCR findings were not consistent. For example, the tissue homogenates and ocular fluid tested positive in some but not all cows. In case 5, cow 1, the milk sample tested negative by IAV screening PCR, but the spleen homogenate tested positive by IAV screening, H5 subtype, and H5 2.3.4.4 PCR. For 2 cows (case 3, cow 1; and case 4, cow 1) that had both milk and rumen contents available, both samples tested positive for IAV. Nevertheless, all IAV-positive nonmammary gland tissue homogenates, ocular fluid, and rumen contents had markedly elevated Ct values in contrast to the low Ct values for milk and mammary gland homogenate samples.

We tested brain and lung samples from the 2 cats (case 6, cats 1 and 2) by IAV screening and H5 subtype-specific PCR ( Table 3 ). Both sample types were positive by IAV screening PCR; Ct values were 9.9–13.5 for brain and 17.4–24.4 for lung samples, indicating high amounts of virus nucleic acid in those samples. The H5 subtype and H5 2.3.4.4 PCR results were also positive for the brain and lung samples; Ct values were consistent with the IAV screening PCR ( Table 3 ).

Phylogenetic Analyses

We assembled the sequences of all 8 segments of the HPAI viruses from both cow milk and cat tissue samples. We used the hemagglutinin (HA) and neuraminidase (NA) sequences specifically for phylogenetic analysis to delineate the clade of the HA gene and subtype of the NA gene.

Figure 3 . Phylogenetic analysis of hemagglutinin gene sequences in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024. Colors indicate different...

For HA gene analysis, both HA sequences derived from cow milk samples exhibited a high degree of similarity, sharing 99.88% nucleotide identity, whereas the 2 HA sequences from cat tissue samples showed complete identity at 100%. The HA sequences from the milk samples had 99.94% nucleotide identities with HA sequences from the cat tissues, resulting in a distinct subcluster comprising all 4 HA sequences, which clustered together with other H5N1 viruses belonging to clade 2.3.4.4b ( Figure 3 ). The HA sequences were deposited in GenBank (accession nos. PP599465 [case 2, cow 1], PP599473 [case 2, cow 2], PP692142 [case 6, cat 1], and PP692195 [case 6, cat 2]).

Figure 4 . Phylogenetic analysis of neuraminidase gene sequences in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024. Colors indicate different...

For NA gene analysis, the 2 NA sequences obtained from cow milk samples showed 99.93% nucleotide identity. Moreover, the NA sequences derived from the milk samples exhibited complete nucleotide identities (100%) with those from the cat tissues. The 4 NA sequences were grouped within the N1 subtype of HPAI viruses ( Figure 4 ). The NA sequences were deposited in GenBank (accession nos. PP599467 [case 2, cow 1], PP599475 [case 2, cow 2], PP692144 [case 6, cat 1], and PP692197 [case 6, cat 2]).

This case series differs from most previous reports of IAV infection in bovids, which indicated cattle were inapparently infected or resistant to infection ( 9 ). We describe an H5N1 strain of IAV in dairy cattle that resulted in apparent systemic illness, reduced milk production, and abundant virus shedding in milk. The magnitude of this finding is further emphasized by the high death rate (≈50%) of cats on farm premises that were fed raw colostrum and milk from affected cows; clinical disease and lesions developed that were consistent with previous reports of H5N1 infection in cats presumably derived from consuming infected wild birds ( 10 – 12 ). Although exposure to and consumption of dead wild birds cannot be completely ruled out for the cats described in this report, the known consumption of unpasteurized milk and colostrum from infected cows and the high amount of virus nucleic acid within the milk make milk and colostrum consumption a likely route of exposure. Therefore, our findings suggest cross-species mammal-to-mammal transmission of HPAI H5N1 virus and raise new concerns regarding the potential for virus spread within mammal populations. Horizontal transmission of HPAI H5N1 virus has been previously demonstrated in experimentally infected cats ( 13 ) and ferrets ( 14 ) and is suspected to account for large dieoffs observed during natural outbreaks in mink ( 15 ) and sea lions ( 16 ). Future experimental studies of HPAI H5N1 virus in dairy cattle should seek to confirm cross-species transmission to cats and potentially other mammals.

Clinical IAV infection in cattle has been infrequently reported in the published literature. The first report occurred in Japan in 1949, where a short course of disease with pyrexia, anorexia, nasal discharge, pneumonia, and decreased lactation developed in cattle ( 17 ). In 1997, a similar condition occurred in dairy cows in southwest England leading to a sporadic drop in milk production ( 18 ), and IAV seroconversion was later associated with reduced milk yield and respiratory disease ( 19 – 21 ). Rising antibody titers against human-origin influenza A viruses (H1N1 and H3N2) were later again reported in dairy cattle in England, which led to an acute fall in milk production during October 2005–March 2006 ( 22 ). Limited reports of IAV isolation from cattle exist; most reports occurred during the 1960s and 1970s in Hungary and in the former Soviet Union, where H3N2 was recovered from cattle experiencing respiratory disease ( 9 , 23 ). Direct detection of IAV in milk and the potential transmission from cattle to cats through feeding of unpasteurized milk has not been previously reported.

An IAV-associated drop in milk production in dairy cattle appears to have occurred during > 4 distinct periods and within 3 widely separated geographic areas: 1949 in Japan ( 17 ), 1997–1998 and 2005–2006 in Europe ( 19 , 21 ), and 2024 in the United States (this report). The sporadic occurrence of clinical disease in dairy cattle worldwide might be the result of changes in subclinical infection rates and the presence or absence of sufficient baseline IAV antibodies in cattle to prevent infection. Milk IgG, lactoferrin, and conglutinin have also been suggested as host factors that might reduce susceptibility of bovids to IAV infection ( 9 ). Contemporary estimates of the seroprevalence of IAV antibodies in US cattle are not well described in the published literature. One retrospective serologic survey in the United States in the late 1990s showed 27% of serum samples had positive antibody titers and 31% had low-positive titers for IAV H1 subtype-specific antigen in cattle with no evidence of clinical infections ( 24 ). Antibody titers for H5 subtype-specific antigen have not been reported in US cattle.

The susceptibility of domestic cats to HPAI H5N1 is well-documented globally ( 10 – 12 , 25 – 28 ), and infection often results in neurologic signs in affected felids and other terrestrial mammals ( 4 ). Most cases in cats result from consuming infected wild birds or contaminated poultry products ( 12 , 27 ). The incubation period in cats is short; clinical disease is often observed 2–3 days after infection ( 28 ). Brain tissue has been suggested as the best diagnostic sample to confirm HPAI virus infection in cats ( 10 ), and our results support that finding. One unique finding in the cats from this report is the presence of blindness and microscopic lesions of chorioretinitis. Those results suggest that further investigation into potential ocular manifestations of HPAI H5N1 virus infection in cats might be warranted.

The genomic sequencing and subsequent analysis of clinical samples from both bovine and feline sources provided considerable insights. The HA and NA sequences derived from both bovine milk and cat tissue samples from different Texas farms had a notable degree of similarity. Those findings strongly suggest a shared origin for the viruses detected in the dairy cattle and cat tissues. Further research, case series investigations, and surveillance data are needed to better understand and inform measures to curtail the clinical effects, shedding, and spread of HPAI viruses among mammals. Although pasteurization of commercial milk mitigates risks for transmission to humans, a 2019 US consumer study showed that 4.4% of adults consumed raw milk > 1 time during the previous year ( 29 ), indicating a need for public awareness of the potential presence of HPAI H5N1 viruses in raw milk.

Ingestion of feed contaminated with feces from wild birds infected with HPAI virus is presumed to be the most likely initial source of infection in the dairy farms. Although the exact source of the virus is unknown, migratory birds (Anseriformes and Charadriiformes) are likely sources because the Texas panhandle region lies in the Central Flyway, and those birds are the main natural reservoir for avian influenza viruses ( 30 ). HPAI H5N1 viruses are well adapted to domestic ducks and geese, and ducks appear to be a major reservoir ( 31 ); however, terns have also emerged as an important source of virus spread ( 32 ). The mode of transmission among infected cattle is also unknown; however, horizontal transmission has been suggested because disease developed in resident cattle herds in Michigan, Idaho, and Ohio farms that received infected cattle from the affected regions, and those cattle tested positive for HPAI H5N1 ( 33 ). Experimental studies are needed to decipher the transmission routes and pathogenesis (e.g., replication sites and movement) of the virus within infected cattle.

In conclusion, we showed that dairy cattle are susceptible to infection with HPAI H5N1 virus and can shed virus in milk and, therefore, might potentially transmit infection to other mammals via unpasteurized milk. A reduction in milk production and vague systemic illness were the most commonly reported clinical signs in affected cows, but neurologic signs and death rapidly developed in affected domestic cats. HPAI virus infection should be considered in dairy cattle when an unexpected and unexplained abrupt drop in feed intake and milk production occurs and for cats when rapid onset of neurologic signs and blindness develop. The recurring nature of global HPAI H5N1 virus outbreaks and detection of spillover events in a broad host range is concerning and suggests increasing virus adaptation in mammals. Surveillance of HPAI viruses in domestic production animals, including cattle, is needed to elucidate influenza virus evolution and ecology and prevent cross-species transmission.

Dr. Burrough is a professor and diagnostic pathologist at the Iowa State University College of Veterinary Medicine and Veterinary Diagnostic Laboratory. His research focuses on infectious diseases of livestock with an emphasis on swine.

Acknowledgment

We thank the faculty and staff at the ISUVDL who contributed to the processing and analysis of clinical samples in this investigation, the veterinarians involved with clinical assessments at affected dairies and various conference calls in the days before diagnostic submissions that ultimately led to the detection of HPAI virus in the cattle, and the US Department of Agriculture National Veterinary Services Laboratory and NAHLN for their roles and assistance in providing their expertise, confirmatory diagnostic support, and communications surrounding the HPAI virus cases impacting lactating dairy cattle.

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• Figure 1 . Mammary gland lesions in cattle in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024. A, B) Mammary...
• Figure 2 . Lesions in cat tissues in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024. Tissue sections were stained...
• Figure 3 . Phylogenetic analysis of hemagglutinin gene sequences in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024. Colors indicate...
• Figure 4 . Phylogenetic analysis of neuraminidase gene sequences in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024. Colors indicate...
• Table 1 . Microscopic lesions observed in cattle in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024
• Table 2 . Microscopic lesions observed in cats in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024
• Table 3 . PCR results from various specimens in study of highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024

Suggested citation for this article : Burrough ER, Magstadt DR, Petersen B, Timmermans SJ, Gauger PC, Zhang J, et al. Highly pathogenic avian influenza A(H5N1) clade 2.3.4.4b virus infection in domestic dairy cattle and cats, United States, 2024. Emerg Infect Dis. 2024 Jul [ date cited ]. https://doi.org/10.3201/eid3007.240508

DOI: 10.3201/eid3007.240508

Original Publication Date: April 29, 2024

Table of Contents – Volume 30, Number 7—July 2024

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Eric R. Burrough, Iowa State University Veterinary Diagnostic Laboratory, 1937 Christensen Dr, Ames, IA 50011, USA

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