Este libro pretende dar métodos, criterios y recursos a aquellos que quieren dominar la expresión escrita, detallando todos los pasos que determinan la calidad de un texto, desde la elaboración de un esquema previo hasta la revisión definitiva.
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.