MI CUERPO ES UN CAMPO DE BATALLA ha sido el espacio artístico de encuentro de un grupo de mujeres, el colectivo Ma colère, que han decidido reapropiarse de su ira para atreverse a redefinir su propio cuerpo.
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.