In 1971, DC's classic mystery series returned to its horror roots starting with the story that introduced the Swamp Thing. The series focused on short, moody tales of the macabre. This first HOUSE OF SECRETS volume features the work of legendary artists including Bernie Wrightson, Sergio Aragonés, Wally Wood, Michael Kaluta and others, collected in color for the first time.
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.