With the unrivaled success of Loft Bible in mind and the idea of appealing to an even broader public, Tectum Publishers has now published a smaller, handier and cheaper version of this definitive book about loft living. The Mini Bible comprises the same practical information on location, size and architect of the projects discussed, but is now presented in a more convenient and compact format.
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.