Proctor Stafford, Los Angeles, early 1960s–ca. 1996; [Ancient Art of the New World, Inc., New York, until1996]
Coe, Michael D. and Sophie D. "Pre-classic central Mexico." In The Jaguar's Children. New York: Museum of Primitive Art, 1965.
von Winning, Hasso. Pre-columbian Art of Mexico and Central America. New York: Abrams, 1968, p.33, pl. 9.