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.
Of all the students in my English class in Spain, I probably had the easiest time reading these stories... The Story Of The Siren, E.M. Forster Feuille D’Album, Katherine Mansfield The Bum, W. Somerset Maugham Kew Gardens, Virginia Woolf Tactical Exercise, Evelyn Waugh Sredni Vashtar, Saki possibly more?