Citing Multiple Works With Three or More Authors and the Same Date
To avoid ambiguity, when the in-text citations of multiple works with three or more authors shorten to the same form, write out as many names as needed to distinguish the references, and abbreviate the rest of the names to “et al.” in every citation.
For example, if these two sources were cited in the same paper, three author surnames would be shown in each case before the rest of the surnames are abbreviated to “et al.”:
Kapoor, Bloom, Montez, et al. (2017)
Kapoor, Bloom, Zucker, et al. (2017)
Because “et al.” is plural (meaning “and others”), it cannot stand for only one name. In cases where only the final author is different, spell out all names in every citation:
Hasan, Liang, Kahn, and Jones-Miller (2015)
Hasan, Liang, Kahn, and Weintraub (2015)