Schele, Linda. 1995. "The Olmec Mountain and Tree of Creation in Mesoamerican Cosmology". Olmec World : Ritual and Rulership: 5:109, Fig. 14a;
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.: 283, Plate 111c;
Schele, Linda, and Peter Mathews. 1998. The Code of Kings: The Language of Seven Sacred Maya Temples and Tombs. New York: Scribner: 8: 113, Fig. 3.18