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.: 310, Plate 122;
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.: 70, Fig. 2:4