Seven classic adventures in one handsome hardcover volume! This specially priced collection includes Treasure Island by Robert Louis Stevenson, Robinson Crusoe by Daniel Defoe, The Red Badge of Courage by Stephen Crane, Gulliver's Travels by Jonathan Swift, Time Machine and The Invisible Man by H. G. Wells, and The Adventures of Tom Sawyer by Mark Twain.
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.