Various is the correct author for any book with multiple unknown authors, and is acceptable for books with multiple known authors, especially if not all are known or the list is very long (over 50).
If an editor is known, however, Various is not necessary. List the name of the editor as the primary author (with role "editor"). Contributing authors' names follow it.
Note: WorldCat is an excellent resource for finding author information and contents of anthologies.
I was bitterly disappointed to find that this was a book which would half colour the pictures for me, leaving limited options for completing any pictures. Not only this, but being double sided printing, it also limits the option for which medium to use.