Richard Townsend, ed. Ancient West Mexico: Art and Archaeology of the Unknown Past. Chicago: Art Institute of Chicago, 1998, 9, pp. 50, 52.
Butterwick, Kristi. Heritage of Power: Ancient Sculpture From West Mexico: The Andrall E. Pearson Family Collection. New York, New Haven, London: The Metropolitan Museum of Art, 2004, 9, 50-52.