Designed for intermediate-level students who wish to improve their pronunciation, this addition to the "Headway" English language teaching series contains exercises which are suitable for classroom use, the language laboratory or for students working independently.
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.