How Many Authors Before You Use 'et al.'?

APA 7: the three-author line

APA 7 is the strictest and simplest: one or two authors get named every single time, and from three authors on, every in-text citation becomes first author plus 'et al.' Even the first appearance takes the short form — APA dropped its old first-citation exception in the 7th edition. A six-author paper reads (Ngo et al., 2022) on page one and on page twelve alike. Italics never touch the abbreviation.

The reference list follows a different rule and students miss it constantly. Up to twenty authors appear by name in the reference entry, separated by commas with an ampersand before the final name. Only at twenty-one authors does APA insert an ellipsis and drop to the first nineteen plus the last. That entry ends with the final author's name, no period after the ellipsis, and the publication year stays in its usual place.

The numbers at a glance

The et al. threshold in every major style — the range, and where each row actually shows up in coursework. Skim it first; the sections below explain why the range exists and which row applies to you.

MLA 9: one rule for prose and Works Cited

MLA 9 applies one threshold everywhere: from three authors on, both the in-text citation and the Works Cited entry use first author plus et al. There is no version of MLA that lists six authors in a citation — if your draft does, it is formatted like APA by mistake. The in-text form drops the comma: (Okafor et al. 88).

The abbreviation replaces every author after the first in the Works Cited too, which surprises students who copied full author lists from a database. MLA assumes a reader can find the team through the first name alone, so the entry ends with the title and publication details exactly as a single-author entry would. Two-author works take both names in normal order, and that rule has no exceptions in MLA 9. That one never changes.

Chicago: three different thresholds in one system

Chicago notes-bibliography uses the widest spread. A note names up to three authors; from four on, the note lists the first author plus et al. The bibliography is more patient: it lists up to ten authors in full and only switches to et al. for eleven or more. A four-author paper therefore shows a shortened note but a complete bibliography entry. The note never spells out four names, even on first citation.

Author-date Chicago mirrors the notes rule with one difference: the reference list caps at ten named authors instead of listing twenty the way APA does. If your course uses Chicago and your source has eleven authors, the bibliography entry takes the first seven followed by three dots and the final author — Chicago's own ellipsis pattern. Check which Chicago variant your department teaches before drafting.

The mistakes that cost points

Three errors repeat every semester. Students apply APA's threshold to MLA and shorten a two-author source — MLA names both authors every time. They write 'et. al.' with a period after et; the abbreviation is 'et al.' with one period, and it is never italicized. And they forget the comma before et al. in APA parenthetical citations.

The fix is mechanical: pick the row of the table above that matches your style, then search your draft for every multi-author citation and check it against that row. Ten minutes of checking beats losing rubric points on a formatting line that graders verify first because it takes them two seconds per citation. The same pass catches sources you cited with the wrong style entirely, which happens most often after quoting from a psychology paper inside an English assignment.

Three minutes to a clean citation

Edge-case citations punish hesitation, not ignorance: the student who spends twenty minutes googling a no-author format loses more time to doubt than the format ever costs. Decide the pattern once — title moves forward, organization counts as author, n.d. when no date exists anywhere — and apply it mechanically. Consistency across your list matters more to graders than perfect recall of manual arcana.

Automate what's mechanical. The citation generator below formats journal articles, books, chapters and websites in all three major styles, including the awkward cases on this page. Paste the metadata, copy the output, done — the minutes you save belong to analysis, which is where rubric points actually live. Cross-check in-text forms against the table above and the reference list is submission-ready.