Freidel, David A., Linda Schele, and Joy Parker. 1993. Maya Cosmos: Three Thousand Years on the Shaman's Path. New York: W. Morrow: 94, Fig. 2:28;
Schele, Linda, and Peter Mathews. 1998. The Code of Kings: The Language of Seven Sacred Maya Temples and Tombs. New York: Scribner: 8: 223, Fig. 6.19;
Schele, Linda, Mary Ellen Miller, and Justin Kerr. 1986. The Blood of Kings: Dynasty and Ritual in Maya Art. New York: G. Braziller: 141, Fig. III.9