How Many Authors To List in APA? | The Exact Rule

If you’ve stared at a source with a long author line and thought, “Do I write all of these names out?” you’re not alone. APA rules feel simple with one or two authors. Then a journal article shows up with twelve, or twenty-three, and the easy part disappears.

Here’s the clean answer. In APA 7th edition, the number of authors you list depends on where the names appear. The reference list and the in-text citation do not use the same rule. That’s where many students get tripped up.

This article breaks the rule down in plain language, shows what changes at each author count, and gives you a quick way to check your work before you submit a paper. If you only need one takeaway, it’s this: reference entries can carry a long list of names, but in-text citations shorten fast.

Why This Rule Trips People Up

APA asks you to do two jobs at once. First, you need a full reference list entry that helps the reader find the source. Second, you need an in-text citation that keeps your sentence readable. Those goals aren’t the same, so the author rule shifts with the setting.

That shift also changed from APA 6 to APA 7. Older handouts, old class slides, and stale blog posts still circulate online. If a source says to list only the first six authors before an ellipsis, that source is using the old edition. APA 7 expanded the reference list rule, and that one update changed a lot of examples people still copy.

There’s another snag. Some teachers say “list all authors,” which is true only up to a point in the reference list. Others say “use et al.,” which is true for many in-text citations. Both can sound right, yet they apply to different parts of the paper.

Author Rules In The Reference List

The reference list is the full citation at the end of your paper. This is where APA gives the longest author line.

One To 20 Authors

If a work has 1 to 20 authors, list every author in the reference entry. Use each author’s last name, then initials. Put commas between names. Add an ampersand before the last author.

That means a source with 3 authors, 8 authors, or 20 authors gets every name written out in the reference list. No shortening. No ellipsis.

21 Or More Authors

If a work has 21 or more authors, list the first 19 authors, then add an ellipsis, then give the final author’s name. Do not add an ampersand before the last author in this case.

This is the part many writers miss. You do not list the first 20 and stop. You list the first 19, then the ellipsis, then the final author. That keeps the total format in line with APA 7.

What Counts As An Author

An author can be one person, several people, or a group name such as an agency, association, or research team. If the source credits a group author, use that group name as the author. If the source has both individual authors and a group author, follow the order given in the source itself.

APA Style’s note on how many names to include in a reference spells out the 20-author and 21-plus-author rule. The broader author-date citation system page also shows how the in-text side works. If you want a second teaching source with side-by-side examples, Purdue OWL’s page on APA author listings is handy.

How Many Authors To List In APA? By Citation Type

Now let’s separate the rules by location. This is the easiest way to stop mixing them up.

In-Text Citations

In APA 7, in-text citations shorten much sooner than reference entries do.

• 1 author: Use the author’s last name and year.
• 2 authors: Use both last names every time.
• 3 or more authors: Use the first author’s last name plus “et al.” from the first citation onward.

So, a source with 3 authors and a source with 18 authors may look different in the reference list, yet both can appear as the first author plus “et al.” in the text.

There is one wrinkle. If two different sources would shorten to the same “et al.” form, you add enough names to tell them apart. That doesn’t happen often, but it does come up in papers that use many studies by the same lead author.

Number Of Authors	Reference List Rule	In-Text Citation Rule
1	List the one author	Use one last name and year
2	List both authors	Use both last names every time
3	List all 3 authors	Use first author + et al.
4	List all 4 authors	Use first author + et al.
5	List all 5 authors	Use first author + et al.
6 to 20	List every author	Use first author + et al.
21 or more	List first 19, ellipsis, final author	Use first author + et al.
Group author	List the group name	Use the group name; shorten only if APA allows it

What The Rule Looks Like In Real Papers

Let’s make this concrete.

A Journal Article With Three Authors

In the reference list, you would write all three authors. In the text, you would cite only the first author’s last name plus “et al.” and the year. That split feels odd at first, but it’s standard APA 7 practice.

A Source With Twenty Authors

Yes, you still list every one of them in the reference entry. This is where people often stop too early. Twenty authors still counts as “list them all.” The ellipsis begins only when the source has 21 or more authors.

A Source With Twenty-One Authors

This is the threshold that matters. You list the first 19 authors, then an ellipsis, then the final author. In the text, nothing new happens. You still use the first author plus “et al.”

An Organization As Author

If the source was written by a government office, medical body, school, or research center, the group name can stand in the author spot. In that case, count the group as the author rather than hunting for individual names that aren’t credited on the source.

How To Get It Right Every Time

You don’t need to memorize a giant chart. A short check routine works better.

1. Look at the source and count the credited authors.
2. Ask where you are citing it: in the text or in the reference list.
3. If it is the reference list, use all names up to 20.
4. If it is 21 or more, write the first 19, then an ellipsis, then the final author.
5. If it is an in-text citation with 3 or more authors, shorten it to the first author plus “et al.”
6. Scan your paper once more to catch places where you mixed old APA 6 rules into an APA 7 paper.

This takes less time than fixing a whole reference page after feedback. It also helps when citation tools spit out the wrong format. Citation generators can save time, but they still need a human pass.

Situation	What To Do	Common Slip
2-author source in text	Use both last names every time	Shortening to et al. too soon
3-author source in text	Use first author + et al.	Writing all 3 names in each citation
20-author reference	List all 20 names	Adding an ellipsis too early
21-author reference	List first 19, ellipsis, final author	Listing first 20 and stopping
Group author	Use the group name as author	Forcing staff names into the citation

Common Mistakes That Cost Points

One common slip is mixing editions. A student uses APA 7 heading rules and title-page format, then cites long author lists with APA 6 rules. That patchwork stands out right away.

Another slip is treating the reference list and the in-text citation as twins. They are linked, but they are not identical. The reference list is built to identify the source in full. The in-text citation is built to keep the sentence clean and readable.

Writers also trip over the ampersand. In a reference entry with 2 to 20 authors, the ampersand comes before the final author. In a 21-plus-author reference, you do not place an ampersand before the last name after the ellipsis.

Then there’s “et al.” punctuation. “Et” has no period after it. “Al.” does. That tiny mark gets checked more often than people think.

When You Should Double-Check The Source Itself

Some databases shorten author lines on the search-results page. Click into the full record before you count. Also watch for group authors, editors, and site names. They don’t all belong in the same place, and databases don’t always label them well.

If your source came from a citation manager, compare the output against the source once. You’re checking for missing initials, author order, and stray punctuation. That last review can save a lot of red ink.

So, how many authors do you list in APA? In the reference list, list every author up to 20. At 21 or more, list the first 19, add an ellipsis, and then the final author. In the text, once a source has 3 or more authors, shorten it to the first author plus “et al.” That’s the rule most papers need.