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.
Catálogo muy completo de las distintas culturas indígenas de Colombia. Demuestra en este el gran valor que estas tenían, sus tan elaboradas simbologías y formas de creación. Ma ayudó a interesarme aún más en las culturas indígenas de Colombia y sus formas tan interesantes de ver la naturaleza, el cosmos, la muerte y la vida en sí.
It was nice to delve into this book and remember my holiday. It is very well put together, great paper quality and photographs. Also plenty of information about the cultures and the artefacts, so it does not feel like just a souvenir, but like and actual book one can read and learn from.