Schele, Linda, and David A. Freidel. 1990. The Code of Kings: The Language of Seven Sacred Maya Temples and Tombs. New York: William Morrow and Company, Inc.: 371-372;
Schele, Linda, and Peter Mathews. 1998. The Code of Kings: The Language of Seven Sacred Maya Temples and Tombs. New York: Scribner: 8: 232, Fig. 6. 29,B6