Schele, Linda, and David A. Freidel. 1990. A Forest of Kings: The Untold Story of the Ancient Maya. New York: William Morrow and Company, Inc.: 53-54, Fig. 45;
Freidel, David A., Linda Schele, and Joy Parker. 1993. Maya Cosmos: Three Thousand Years on the Shaman's Path. New York: W. Morrow: 318, Fig. 7: 22L;
Schele and P. Mathews, The Code of Kings: The Language of Seven Sacred Maya Temples and Tombs. 1998: 411