It's common in my field to have articles with many (>>6) authors including several "co-first authors." For example:
A. Anderson*, B. Brown*, C. Clark, D. Davidson, ..., Z. Zed
* These authors contributed equally to the work.
When citing a paper with many authors in APA style, one would normally use the following citation (Anderson et al. 2017).
However, in this case where there are multiple co-first authors, would it be appropriate to include all co-first authors in the citation e.g., "(Anderson, Brown et al. 2017)"?
Obviously, once there are 4 or more co-first authors, it gets cumbersome to include all of them. Also, I realize that this alternate citation format is by no means necessary if it's even allowed at all. My gut reaction is that this still would be inappropriate since it would look out of place; at the same time, I want to acknowledge all of the main authors' work on this article.