This book provides a wide-ranging overview of the many and diverse issues in applied linguistics today. Leading specialists consider the relation of their own areas of enquiry both to professional practice and to the discipline as a whole.
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.