1995-Images from the Underworld Naj Tunich and the Tradition of Maya Cave Painting ISBN 978-0-292-75552-9*Brady, James E. 1989 An Investigation of Maya Ritual Cave Use with Special Reference to Naj Tunich, Peten, Guatemala.
1995-Images from the Underworld Naj Tunich and the Tradition of Maya Cave Painting ISBN 978-0-292-75552-9* Brady, James E. y Sandra Villagrán de Brady, 1991 -La arqueología de la cueva Naj Tunich: Patrones de utilización ritual.