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.
It's based on the original 1847 version and contains a whole bunch of helpful discussion of criticism at the end of the book! It's essentially the 1991 version of a Norton edition with actually more useful help!