Few tiny phrases create as much citation confusion as et al. It looks fancy, sounds slightly mysterious, and somehow manages to make students, researchers, bloggers, and editors pause mid-sentence like they have just discovered a raccoon in the bibliography. The good news? Et al. is not nearly as scary as it looks.
This guide explains how to use et al. to cite multiple authors in MLA, APA, and CMS, also known as Chicago Manual of Style. You will learn what it means, when to use it, where the period goes, whether it should be italicized, and how the rules change depending on the citation style. We will also walk through clear examples so your next paper does not look like it was attacked by a citation generator with commitment issues.
What Does Et Al. Mean?
Et al. is an abbreviation of the Latin phrase et alii, meaning “and others.” In academic writing, it is used when a source has multiple authors and listing every name would make the citation too long or awkward. Instead of writing “Johnson, Martinez, Lee, Patel, and Robinson” every single time, you can often write “Johnson et al.”
The abbreviation has one important punctuation rule: the period goes after al. only. You write et al., not “et. al,” “et. al.,” or “etal.” Think of it as a tiny citation suitcase: et is already complete, while al. is shortened and needs the period.
Why Writers Use Et Al. in Citations
The main purpose of et al. is readability. Academic sources often have three, five, ten, or even dozens of authors, especially in science, medicine, psychology, and education. Without et al., in-text citations could become longer than the actual sentence they support. That is not research writing; that is a parade.
Using et al. keeps citations compact while still pointing readers to the correct full entry in the Works Cited, References, or Bibliography page. The phrase does not hide authors. It simply keeps the sentence readable and directs readers to the complete source information where the style guide requires it.
Quick Comparison: MLA vs. APA vs. CMS
Before diving into each style, here is the big-picture difference:
- MLA: Use et al. for sources with three or more authors in Works Cited entries and parenthetical citations.
- APA: Use et al. in every in-text citation for works with three or more authors, including the first citation.
- CMS / Chicago: In the current Chicago style, use et al. in notes or author-date text citations when a work has more than two authors. Bibliography rules depend on the number of authors.
Now let us break that down without needing three cups of coffee and a librarian on speed dial.
How to Use Et Al. in MLA Style
MLA style is commonly used in literature, language, cultural studies, humanities, and related fields. When citing multiple authors in MLA, the rule is straightforward: if a source has three or more authors, list the first author followed by et al.
MLA In-Text Citation With Et Al.
For MLA parenthetical citations, use the first author’s last name followed by et al. and the page number if available.
Example:
(Garcia et al. 42)
If you mention the author in the sentence, the citation can include only the page number:
Example:
Garcia et al. argue that collaborative learning improves student confidence (42).
Notice that MLA does not use a comma between the author name and page number in the parenthetical citation. It is clean, simple, and refreshingly low-drama.
MLA Works Cited Entry With Et Al.
In the Works Cited list, MLA places the first author’s last name first, followed by the first name, a comma, and et al.
Example:
Garcia, Maria, et al. Writing Across Digital Spaces. Academic Press, 2023.
The comma before et al. appears because the first author’s name is inverted: last name first, first name second. If the author name is not inverted, such as some East Asian names presented in original order, MLA may not require the comma before et al.
Should You Use Et Al. in MLA Prose?
MLA is a little picky here, but in a reader-friendly way. In formal prose, MLA often prefers that you write the first author’s name followed by “and others” or “and colleagues” instead of using the abbreviation et al. in the sentence itself.
Less natural in MLA prose: Smith et al. explain the trend clearly.
More MLA-friendly: Smith and colleagues explain the trend clearly.
However, in parenthetical citations and Works Cited entries, et al. is perfectly normal.
How to Use Et Al. in APA Style
APA style is widely used in psychology, education, nursing, business, social sciences, and other research-heavy fields. APA loves clarity, dates, and rules that look simple until you meet the exception hiding behind the curtain.
In APA 7th edition, the main rule is easy: for a work with three or more authors, use the first author’s last name followed by et al. in every in-text citation, including the first one.
APA Parenthetical Citation With Et Al.
Example:
(Nguyen et al., 2022)
APA includes the year because it uses an author-date system. The comma comes after et al., before the year.
APA Narrative Citation With Et Al.
Example:
Nguyen et al. (2022) found that students performed better when feedback was specific and timely.
In a narrative citation, the author name appears in the sentence and the year appears in parentheses immediately after the author group.
APA Reference List: Do You Use Et Al.?
Here is where many writers accidentally trip over the rug. In APA, et al. is mainly an in-text citation tool. In the reference list, APA usually wants more author names listed.
For works with three to twenty authors, APA lists all authors in the reference entry. For works with more than twenty authors, APA lists the first nineteen authors, inserts an ellipsis, and then lists the final author. So no, you should not automatically write et al. in the APA reference list just because a source has three authors.
APA in-text example:
(Rivera et al., 2021)
APA reference list style:
Rivera, L. M., Chen, A. R., Patel, S. K., & Morrison, T. J. (2021). Title of article. Journal Name, 14(2), 22–39.
APA Ambiguity Rule
APA has one important exception. If two sources shorten to the same et al. form, include enough author names to tell them apart.
Imagine these two sources:
- Brown, Lee, Patel, and Kim, 2020
- Brown, Lee, Gomez, and Tran, 2020
If both became “Brown et al., 2020,” readers would not know which source you mean. APA solves this by adding enough names:
(Brown, Lee, Patel, et al., 2020)
(Brown, Lee, Gomez, et al., 2020)
The goal is not to make your paper longer. The goal is to prevent your reader from playing citation detective.
How to Use Et Al. in CMS / Chicago Style
CMS, short for Chicago Manual of Style, is widely used in history, publishing, arts, humanities, and some social science fields. Chicago has two major citation systems: Notes and Bibliography and Author-Date. Both can use et al., but the format changes depending on where the citation appears.
Chicago Notes and Bibliography Style
In Chicago notes, such as footnotes or endnotes, the current rule is to list up to two authors. If the source has more than two authors, list the first author followed by et al.
Full note example:
1. Daniel Harris et al., Research Methods in Practice (Chicago: Lakeview Press, 2024), 88.
Shortened note example:
2. Harris et al., Research Methods, 91.
Chicago notes do not require every author name in the footnote when the source has three or more authors. This is great news for anyone whose footnotes were beginning to resemble a wedding guest list.
Chicago Bibliography Entry With Multiple Authors
In a Chicago bibliography or reference list, the current guidance is to list up to six authors. If there are more than six authors, list the first three followed by et al.
Example with more than six authors:
Harris, Daniel, Priya Raman, Marcus Lee, et al. Research Methods in Practice. Chicago: Lakeview Press, 2024.
Chicago’s bibliography format gives readers more complete credit than a note does, while still keeping very long author lists manageable.
Chicago Author-Date Style
Chicago author-date style looks more like APA because it places citations in the text. For more than two authors, use the first author followed by et al. and the year.
Example:
(Harris et al. 2024, 88)
Notice that Chicago author-date style does not use a comma between the author and year, unlike APA. Small punctuation difference, big professor-red-pen potential.
Common Et Al. Mistakes to Avoid
1. Putting the Period in the Wrong Place
The correct form is et al. Only al. gets a period. Do not write “et. al.” unless you want your citation to wear mismatched socks.
2. Using Et Al. for Two Authors
In MLA and APA, do not use et al. for two authors. List both names according to the style rules. In Chicago 18, notes and author-date citations also list up to two authors before shortening sources with more than two authors.
3. Assuming Every Style Has the Same Rule
This is the classic citation trap. MLA, APA, and CMS all use et al., but not in exactly the same way. APA uses it for three or more authors in every in-text citation. MLA uses it for three or more authors in parenthetical citations and Works Cited entries. Chicago uses it in notes or author-date citations when there are more than two authors, with separate bibliography rules.
4. Using Et Al. in the Wrong Reference List
APA reference entries usually list all authors up to twenty, while Chicago bibliography entries list up to six before shortening. MLA Works Cited entries shorten at three or more authors. This is why citation style matters. The words may be the same, but the rules are wearing different jackets.
Et Al. Examples by Style
MLA Example
In-text: (Thompson et al. 118)
Works Cited: Thompson, Rachel, et al. Media Literacy in Modern Classrooms. Brightstone Press, 2022.
APA Example
Parenthetical: (Thompson et al., 2022)
Narrative: Thompson et al. (2022) explain that media literacy depends on context and audience awareness.
Reference: Thompson, R., Allen, P., Brooks, L., & Davis, M. (2022). Media literacy in modern classrooms. Brightstone Press.
Chicago Notes and Bibliography Example
Note: 1. Rachel Thompson et al., Media Literacy in Modern Classrooms (Boston: Brightstone Press, 2022), 118.
Bibliography: Thompson, Rachel, Peter Allen, Linda Brooks, and Marcus Davis. Media Literacy in Modern Classrooms. Boston: Brightstone Press, 2022.
Practical Tips for Using Et Al. Correctly
First, identify your required citation style before writing citations. Many citation errors happen because writers mix MLA, APA, and Chicago rules in the same paper. That creates a citation smoothie, and not the healthy kind.
Second, check whether you are writing an in-text citation, a note, a Works Cited entry, a References entry, or a Bibliography entry. Et al. rules often change depending on the citation location.
Third, remember that citation generators can help, but they are not perfect. They often misread author order, punctuation, capitalization, or edition-specific rules. Use them as assistants, not as tiny robots with tenure.
Finally, when in doubt, prioritize clarity. If using et al. makes two sources look identical, add more author names according to your style guide. A correct citation should help readers find the source without needing a treasure map.
Personal Experience and Real-World Lessons: Using Et Al. Without Losing Your Mind
Anyone who has edited academic writing for more than five minutes knows that et al. is where confidence goes to wobble. The phrase is short, but it sits at the intersection of grammar, citation style, author credit, and professor preferences. In real writing projects, the biggest challenge is rarely understanding what et al. means. The challenge is remembering which rule belongs to which citation style while your deadline is staring at you like an unpaid bill.
One of the most useful habits is to create a mini citation checklist before drafting. For example, if the paper is in APA, write this note at the top of your draft: “Three or more authors = first author et al. in every in-text citation.” That one sentence can prevent dozens of tiny errors. If the paper is in MLA, write: “Three or more authors = first author et al. in Works Cited and parenthetical citations.” If the project uses Chicago, write: “More than two authors = first author et al. in notes or author-date text citations; check bibliography rules separately.” These small reminders save a surprising amount of editing time.
Another practical lesson is to organize sources before writing the paper. Many writers collect PDFs, articles, books, and web pages first, then try to build citations at the end. That works until you realize you have four articles by “Miller et al.” from the same year and no idea which one supports which paragraph. A better method is to record the full author list, year, title, and page numbers in a working document as soon as you save the source. Future-you will be grateful. Future-you may even forgive present-you for opening sixteen browser tabs.
It also helps to understand that et al. is not about hiding contributors. Some students worry that using it is disrespectful to the other authors. In reality, citation styles use it because readers need a fast, readable path through the text. Full credit still appears where the style requires it, such as the APA reference list or the Chicago bibliography. The in-text citation is a signpost, not a trophy case.
When editing, search your document for “et al” without the period. This quick check catches missing punctuation, inconsistent formatting, and accidental variations like “Et Al.” or “etal.” Also search for the first author names of multi-author sources. If you see the same shortened citation pointing to multiple sources from the same year, check for ambiguity. This is especially important in APA, where similar author groups can create identical shortened citations.
The final real-world lesson is simple: citation style is not a personality test. Making a mistake with et al. does not mean you are bad at research. It means citation systems are detailed, and details require a system. Once you learn the pattern, et al. becomes one of the easiest tools in academic writing. It shortens crowded citations, keeps sentences readable, and lets your argument stay in the spotlight instead of being buried under a mountain of surnames.
Conclusion
Learning how to use et al. to cite multiple authors in MLA, APA, and CMS is mostly about knowing which style you are using and where the citation appears. MLA uses et al. for three or more authors in Works Cited entries and parenthetical citations. APA uses it for three or more authors in every in-text citation, including the first citation, while listing more authors in the reference entry. Chicago uses it in notes and author-date citations when there are more than two authors, with bibliography rules that depend on the number of authors.
Once you remember those differences, et al. stops looking like a Latin booby trap and starts acting like what it really is: a neat little shortcut that keeps your writing clean, professional, and easy to read.
