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APA Citation Multiple Authors: Complete ‘Et Al.’ Guide (2026)

Need to cite a source with multiple authors in APA Style and don’t know whether to use “et al.” or list every name? You’re in the right place. This guide covers every multiple-author citation rule in APA 7th edition — including the 2-author rule, the 3+ author “et al.” rule, the rarely-reported “same et al.” ambiguity exception, and the 21+ author reference list formatting — with copy-paste examples you can use immediately.

Key Takeaways

  • 2 authors? List both every time — use “&” in parentheses, “and” in narrative.
  • 3+ authors? Use “et al.” from the very first citation (APA 7th edition, not 6th).
  • Reference list? Never use “et al.” — list all names for 1–20 authors, use ellipsis for 21+.
  • “Same et al.” form? Spell out ALL names when two different sources shorten to the same form.
  • Punctuation? Period only after “al.” (not “et”). Never italicize “et al.”

Introduction: Why This Matters

When you’re writing a paper and you’ve used a source with multiple authors, the citation format depends entirely on how many authors the source has. Get it wrong, and your professor will notice — or worse, your peer reviewers will flag it.

Most students know the basic rule: “3 or more authors, use ‘et al.’.” But what happens with 2 authors? What about sources with 21+ names? What if two different sources with 3+ authors shorten to the same “et al.” form? Those are the questions nobody covers in your textbook.

This article answers every multiple-author citation rule in APA 7th edition. Whether you’re citing a psychology paper with 2 authors, a nursing study with 5 authors, or a government report with 25 contributors, this guide has the exact format you need.

Note: If you haven’t used APA style before, the APA Citation Across Disciplines guide covers the broader APA rules. If you want to compare APA with MLA, Chicago, and other styles, check our Citation Styles Compared.

The 2-Author Rule: Ampersand vs. “And”

When a source has exactly 2 authors, APA 7th edition gives you two citation formats depending on whether you’re writing parenthetically or narratively.

Parenthetical Citation (use “&”)

When you cite the source at the end of your sentence, use the ampersand (&):

(Smith & Jones, 2024)

Example in context:

Recent studies show that cognitive behavioral therapy is significantly more effective than traditional counseling (Smith & Jones, 2024).

Narrative Citation (use “and”)

When you mention the authors as part of your sentence, use “and”:

Smith and Jones (2024) found that cognitive behavioral therapy is significantly more effective than traditional counseling.

This distinction matters. Using “&” in a narrative citation or “and” in a parenthetical citation is one of the most common errors students make — and it’s the first thing editors check.

Pro tip: Think of it this way: in parentheses, symbols replace words (just like you’d write “Dr.” instead of “Doctor”). In narrative, spell it out (“and” instead of “&”).

The 3+ Author “Et Al.” Rule (From First Citation)

When a source has 3 or more authors, APA 7th edition requires you to shorten the citation using “et al.” (meaning “and others”) from the very first in-text citation.

Important: This is a major change from APA 6th edition. In APA 6th, you listed all authors on the first citation and only used “et al.” on subsequent citations. APA 7th simplified this — “et al.” from the first citation, every time.

Parenthetical Example

(Johnson, Williams, Brown, et al., 2023)

Narrative Example

Johnson, Williams, Brown, et al. (2023) demonstrated that…

Wait — what? You spell out the first author, then “et al.” — but do you list the other authors between the first and “et al.”? According to the APA Style blog, no: you list only the first author’s name, followed by “et al.”:

Correct: (Johnson et al., 2023) — first author only + et al.
Incorrect: (Johnson, Williams, Brown, et al., 2023) — listing authors before et al.

This applies to every in-text citation — first citation, second citation, tenth citation. The rule does not change based on how many times you’ve cited the source.

Why This Change Matters

The APA 7th edition committee removed the “first citation” distinction because it created unnecessary cognitive load for students and researchers. Instead of tracking which citations you’ve already used, you can apply the same rule consistently. This is the kind of simplification that makes APA 7th edition easier to use.

The APA Style Blog explains that this decision was deliberate — the 7th edition was designed to prioritize clarity and consistency over memorization of edge-case exceptions.

The “Same Et Al.” Ambiguity Exception

Here’s a scenario most students never encounter until it happens to them in their actual paper: you cite two different sources with 3+ authors, and they both shorten to the same form in the same year.

For example:

  • Source A: Kapoor, Bloom, Montez, et al. (2017)
  • Source B: Kapoor, Bloom, Zucker, et al. (2017)

Both shorten to “(Kapoor et al., 2017)” in parentheses. This creates ambiguity — the reader doesn’t know which source you’re citing.

How APA Resolves This

According to the APA Style Official guide on the “same et al.” ambiguity rule, when two different sources with 3+ authors shorten to the same first-author+et al. form in the same year, you must spell out enough names to make the distinction clear.

The critical rule: “et al.” cannot stand for only one name.

Correct Format

(Kapoor, Bloom, Montez, et al., 2017)
(Kapoor, Bloom, Zucker, et al., 2017)

By spelling out all three names (Kapoor, Bloom, Montez vs. Kapoor, Bloom, Zucker), the reader can immediately see which source you’re referencing.

What “Et Al. Cannot Stand for Only One Name” Means

This is a strict rule. When the final author is the only name that differs, you cannot use “et al.” alone — you must spell out every name before “et al.”:

Incorrect: (Kapoor et al., 2017) and (Kapoor et al., 2017) — ambiguous, rejected
Correct: (Kapoor, Bloom, Montez, et al., 2017) and (Kapoor, Bloom, Zucker, et al., 2017) — disambiguated

This is one of those rules that sounds weird at first but makes sense once you think about the reader’s perspective. If your professor sees “(Kapoor et al., 2017)” twice in the same paragraph, they can’t tell which paper you’re citing.

Reference-List Formatting: 1–20 Authors, 21+ Authors

The reference list is where you provide complete bibliographic information so readers can find and retrieve your sources. The “et al.” rule applies only to in-text citations — not the reference list.

Reference List, 1–20 Authors

List ALL authors by name. Never use “et al.” in the reference list.

2 authors:

Smith, J., & Jones, K. (2024). Title of the article. Journal Name, Volume(Issue), pages.

5 authors:

Johnson, M., Williams, P., Brown, R., Davis, S., & Wilson, T. (2023). Title of the article. Journal Name, Volume(Issue), pages.

15 authors:

Thompson, A., Baker, B., Carter, C., Dixon, D., Evans, E., Fisher, F., Grant, G., Harris, H., Irving, I., Jones, J., Kelly, K., Lewis, L., Morgan, M., Nelson, N., & Owen, O. (2024). Title of the article. Journal Name, Volume(Issue), pages.

Reference List, 21+ Authors

When a source has 21 or more authors, APA 7th edition changed the rule (previously it was 15+ in APA 6th). For 21+ authors:

  1. List the first 19 authors by name.
  2. Insert an ellipsis (…) on a new line (or after the last author on the same line).
  3. List the final author.

Example from the APA Style Blog:

Smith, J., Doe, A., Lee, K., Kim, H., Park, S., Chen, W., Patel, R., Garcia, M., Brown, T., Wilson, P., Taylor, J., Anderson, R., Thomas, L., Jackson, S., White, D., Harris, M., Martin, K., Thompson, J., Robinson, A., … Nguyen, B. (2024). Title of the article. Journal Name, Volume(Issue), pages.

The GWU Himmelfarb guide confirms this exact format with a real DOI example.

Why the Reference List Lists All Names

The reference list serves a different purpose than in-text citations. In-text citations prioritize readability (concise “et al.” helps you read faster). The reference list prioritizes source discoverability — readers need enough information to find and retrieve the source. Using “et al.” in the reference list would hide the full author list and make retrieval harder.

“Et Al.” Punctuation Rules

This is where most students lose points — punctuation with “et al.” has specific rules that students often get wrong.

The Period Rule

Only ONE period: after “al.” — not after “et”.

Correct: et al. (period after “al.” only)
Incorrect: et. al. (period after “et” — rejected)

The Italics Rule

Never italicize “et al.” It is always in regular, non-italic font in both in-text citations and reference lists.

Correct: (Smith et al., 2024) — regular font
Incorrect: (Smith et al., 2024) — italicized — rejected

The Comma Rule

Where the comma goes depends on your citation format:

  • Parenthetical: comma after “et al.”: (Smith et al., 2024)
  • Narrative: no comma after “et al.”: Smith et al. (2024)

Note: The comma after “et al.” in parenthetical citations is separate from the comma that precedes the year. Both are required.

Pro tip: Test yourself: if you write “(Smith et al., 2024)” and every time you see “et al.” followed by a comma and a year, you’re following the rule correctly.

Common Mistakes Students Make (and How to Fix Them)

Mistake #1: Using APA 6th Edition Rules

The “first citation, list all authors; subsequent citations, use ‘et al.'” rule no longer exists in APA 7th edition. You use “et al.” from the first citation for 3+ author sources. This is the single most common error in multiple-author citations.

Wrong (APA 6th): First citation lists all authors, then “et al.” afterward.
Correct (APA 7th): “et al.” from first citation.

Mistake #2: Italicizing “Et Al.”

Wrong: (Smith et al., 2024)
Correct: (Smith et al., 2024)

Mistake #3: Using “& Et Al.”

Never combine “&” with “et al.”:

Wrong: (Smith & et al., 2024)
Correct: (Smith et al., 2024)

This error is flagged by editors and professors. “Et al.” already means “and others” — adding “&” is redundant and incorrect.

Mistake #4: Using “Et Al.” in the Reference List

The reference list is not an in-text citation. “Et al.” does not belong in the reference list.

Wrong: Smith, J., et al. (2024)
Correct: Smith, J., Doe, A., & Lee, K. (2024)

Mistake #5: Missing the Period After “Al.”

Wrong: (Smith et al 2024)
Correct: (Smith et al., 2024)

The period after “al.” is not optional. “Et al.” is an abbreviation of the Latin phrase et alii, and the period indicates the abbreviation.

Cross-Style Comparison: APA vs. MLA vs. Chicago

Different citation styles use “et al.” differently. Here’s how the thresholds compare:

Style Et Al. Threshold First Citation Rule Reference List
APA 7th 3+ authors “Et al.” from first citation List all (1-20), ellipsis for 21+
MLA 9th 3+ authors “et al.” from first citation List up to 1, then “et al.”
Chicago 17th 4+ authors List all up to 4, then “et al.” List first 4, then “et al.”
Vancouver/AMA 3+ authors “et al.” from first citation List first 6, then “et al.”

Source: CASRAI Et Al. Citation Rules

Key takeaway: APA and MLA both trigger at 3+ authors. Chicago waits until 4+. Vancouver lists more names before shortening. If you’re writing in multiple styles, use this table to switch between formats.

The SF Edit comparison guide confirms that these thresholds have been stable across editions — the main changes have been in punctuation rules and formatting, not in the author-count thresholds themselves.

Quick-Reference Decision Table

Use this table to determine exactly which citation format applies to your source. Look up your scenario, find the example, and copy the format.

Scenario What to Do Example
2 authors, parenthetical Use & (Smith & Jones, 2024)
2 authors, narrative Use “and” Smith and Jones (2024)
3+ authors, parenthetical Use “et al.” (Smith et al., 2024)
3+ authors, narrative Use “et al.” Smith et al. (2024)
3+ authors, same et al. form Spell out all names (Kapoor, Bloom, Montez, et al., 2017)
Reference list, 1–20 authors List all by name Smith, J., Doe, A., & Lee, K.
Reference list, 21+ authors List 19, ellipsis, final Smith, J., … Lee, A.

Pro tip: Save this table as a reference. You’ll use it every time you cite a source with multiple authors.

Conclusion + Next Steps

Here’s what you need to remember:

  • 2 authors? List both. Use “&” in parentheses, “and” in narrative.
  • 3+ authors? “Et al.” from the first citation. Period after “al.” only. Never italicize.
  • Same “et al.” form? Spell out all names. “Et al.” cannot stand for one name.
  • Reference list? Never use “et al.” — list all names (1–20) or use ellipsis for 21+.

The decision table above is your quick reference — use it every time you write an in-text citation.

Next steps: If you’re working on a paper with multiple citations, apply these rules consistently throughout. If you need help with broader APA formatting — citation across disciplines, AI sources, or anything else — check the APA Citation Across Disciplines guide. If you’re unsure whether you’re using APA, MLA, or Chicago style, our Citation Styles Compared article walks you through every format.

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