APA 7th Edition Citation Style Guide

If a reference does not list an author, use the article title in the author position

Example:

Drought tolerance in crop plants can conserve water, energy. (2008, January 9). Southeast Farm Press. p. 4.

If a reference has between 2 and 20 authors, list each name in the order it appears on the source. Use an ampersand (&) before the final name.  

Example:

Cortés, A. J., Monserrate, F. A., Ramírez-Villegas, J., Madriñán, S., & Blair, M. W. (2013). Drought tolerance in wild plant populations: The case of common beans (Phaseolus vulgaris L.). Plos ONE, 8(5), 1-10. doi:10.1371/journal.pone.0062898

If a reference has 21 or more authors, list the first 19 names followed by an ellipses and the final name listed.

Example:

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, (1), 1935–1968. https://doi.org/10.0000/3mp7y-537

If a reference was authored by a company, organization, or other group, use the group’s formal name. 

Example:

Pew Center on Global Climate Change. (2010). The case for action: Creating a clean energy future. http://www.issuelab.org/resource/case_for_action_creating_a_clean_energy_future