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2. A Pre-Spanish Rubber Ball from Arizona
3. Rodriguez, C., and P. Ortiz 1994 El Manatt, un Espacio Sagrado de los Olmeca. Universidad Veracruzana, Jalapa, Veracruz.
4. Rose, Gene 1994 High Odyssey: The True Story of Orland Bartholomew's Mt. Whitney-Yosemite Expedition.Quill Driver Books, Fresno, California.
5. Scarborough, Vernon L., and David R. Wilcox (editors) 1991 The Mesoamerican Ballgame. University of Arizona Press, Tucson.