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 chuckled my way through this children's book in a very short time on a sleepless night. Little Robert's parents are so methodical and tidy that they even named him Robert Robert. His mother alphabetises things in the kitchen, but since "sugar" and "salt" both begin with S, and there's only one S cannister, she doesn't use either one. But when little Robert drops the dictionary, the words are scattered all over the room! He picks them up and shoves them back between the pages in a hurry, not bothering to organise them...and of course a few have rolled out of his reach in the cracks of the floor or under the furniture. Guests come for dinner...and anarchy ensues!
I was reminded in a way of the beginning of the film "Amelie." Those who have seen it will know what I mean.
An excellent read for students of French. A lot of words that you'll have to look up...which is rather the point, I fancy. Also useful for teachers of French; ask your students what words would work better in the crazy sentences!