Citation Style - APA

In the Bibliography:

Whether for books or articles, it is common to have more than one author (editor). The number of authors (editors) you are allowed to mention is set by the APA rules. There is a difference between the number allowed in your reference entry (bibliography) and the one allowed for your in-text citation.

* As a general rule, You need to mention the names of all the authors (editors) in your bibliography. The maximum number of names allowed in a citation entry is 20.

* In case a book has more than 20 authors (editors), list the first 19 by last names and initials; commas separate author names. After the first 19 use an ellipsis (i.e., …) in place of the remaining names. Thereafter, end with the final author's (editor's) name (do not place an & before it). 

Example reference for an article with more than 20 authors:

Wiskunde, B., Arslan, M., Fischer, P., Nowak, L., Van den Berg, O., Coetzee, L., Juárez, U., Riyaziyyat, E., Wang, C., Zhang, I., Li, P., Yang, R., Kumar, B., Xu, A., Martinez, R., McIntosh, V., Ibáñez, L. M., Mäkinen, G., Virtanen, E., . . . Kovács, A. (2019). Indie pop rocks mathematics: Twenty One Pilots, Nicolas Bourbaki, and the empty set. Journal of Improbable Mathematics, 27(1), 1935–1968. https://doi.org/10.0000/3mp7y-537

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For the In-text Citation:

* For the in-text citation you can mention maximum 5 names, if a book or an article has 6+ authors, mention only the Surname of the 1st author followed by (et al.)

• Parenthetical citation: (Wiskunde et al., 2019)
• Narrative citation: Wiskunde et al. (2019)