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.
This collection of essays (and one short story) from the second year of the online magazine The Bitter Southerner maintains the high standards of the first BS print collection. The writing is consistently excellent and moving. An unexpected favorite was editor Chuck Reece's "The Dirt Underneath," about Will Harris's White Oak Pastures farm outside of Bluffton, Georgia. Harris has adopted sustainable, humane farming methods; this is a subject I didn't much worry or care about until I read Reece's inspiring essay.
Unfortunately, the book is poorly edited. There are several typographical errors, and some odd parenthetical phrases that were presumably hyperlinks in the original web articles. These sloppy details are annoying, but don't detract from the excellence of the writing.