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.
Perfect for a complete novice. Includes a little bit of everything from beginners' handsewing to more advanced techniques like applique, embroidery and patchwork to machine sewing. Three or four projects in each book. Each book is hardback and presented in a slipcase. Makes a pretty gift.