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.: 36, Fig. 12; 121, Plate 33
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.: 142, Fig. 4:12