Goodreads Librarians Group discussion
Book & Author Page Issues
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Books with co-editors
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They should be in the order they appear on the cover.
If you have the book handy and want to put the rest of the details in, you can list out the essays or just the authors in the book details field.
If any of the authors are already prominent writers, you can add them in the 'other author' fields as well, with (Contributor) after their name. This will help to link their work together, but there is no need (and no room) for all 50 authors, IMO.
Thanks!