This nonfiction book is part of the Townsend Library, a collection of high-interest paperbacks published by Townsend Press to promote reading among today's students. Acclaimed by educators nationwide, the Townsend Library is helping millions of young adults discover the pleasure and power of reading.
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.