Q. when citing authors in APA format, do I use et al? and how do I select the author to name?

Thank you for your citation question. I especially love APA questions. See this page https://apastyle.apa.org/blog/more-than-20-authors  for examples on how to do the Reference page and the In-text citation because they have very different rules for each. We also have a video on APA and a handout that you may want to print at https://slulibrary.saintleo.edu/APA-SWK