The first anthology of plays from Actors Theatre, this volume includes: Crimes of the Heart by Beth Henley, Coup/Clux by Jane Martin, Food From Trash by Gary Leon Hill, The Undoing by William Mastrosimone, Tales of the Lost Formicans by Constance Congdon and Getting Out by Marsha Norman.
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.