Ralph L. Roys: The Book of Chilam Balam of Chuyamel. Carnegie Institution, Washington D.C. 1933 (PDF; 3,2 MB), S. 103.
penn.museum
Ruben E. Reina: A Peninsula That May Have Been an Island: Tayasal, Peten, Guatemala. University of Pennsylvania Museum of Archaeology and Anthropology, Philadelphia, Pa. 1966 (PDF), S. 16–29.
transparency.org
Transparency International: Corruption Perceptions Index 1999. In: Transparency International. Transparency International e. V. 1999, abgerufen am 21. August 2019.
Transparency International: Corruption Perceptions Index 2004. In: Transparency International. Transparency International e. V. 2004, abgerufen am 21. August 2019.