Under what circumstances it is appropriate to add a team as a co-author, and how should I do so?
It's not immediately evident in your question but I gather that you are asking about how to cite other people's work. Or possibly previous work to which you partly contributed.

Referencing previous work serves the purpose of giving robust information to your reader to locate said work, not to attribute credit.

In that very aspect of your academic work, don't be creative. What's relevant is the citation style imposed by the journal or conference you are publishing in, or your institution's guidelines for theses, or at the very least, the standard citation style that you chose for that particular document you are writing.



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