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.
Très très bon bouquin. Je n'ai juste pas le niveau en Marxisme et Philisophie. Donc j'ai surtout pris mon pied sur les deux derniers articles. Cependant, faites la même en plus accessible (comme les deux derniers articles donc) et ce sera d'utilité publique !