How many authors do I include in an APA reference list entry?

The APA 6th edition recommends including the names of up to seven authors in a reference list entry. When an article has more than seven authors, replace the names prior to the final listed author with an ellipsis, but do not omit the final author:

Davis, Y., Smith, J., Caulfield, F., Pullman, H., Carlisle, J., Donahue, S. D., … O’Brien, T. (2012).

Note that the 7th edition of the APA manual, published in 2019, recommends including up to 20 authors in a reference list entry.