: (1991) "Then They Were Sacrificed: The Ritual Ballgame of Northeastern Mesoamerica Through Time and Space", in "The Mesoamerican Ballgame", University of Arizona Press, ISBN 0-8165-1360-0.
* Wilkerson, S. Jeffrey K. (1991) «Then They Were Sacrificed: The Ritual Ballgame of Northeastern Mesoamerica Through Time and Space», in "The Mesoamerican Ballgame", University of Arizona Press, ISBN 0-8165-1360-0.