Bernal, Ignacio. 3000 Years of Art and Life in Mexico. New York; Harry N. Abrams Inc. 

Blaton, Richard A., Stephen A. Kowalewski, Gary M. Feinman, Laura M. Finsten. Ancient Mesoamerica: A comparison of change in three regions. Cambridge University Press, 1981, 1993. 

Boone, Elizabeth Hill.  The Aztec World.  Washington D.C; St. Remy Press, 1994. 

Cotterell, Arthur.  The Encyclopedia of the Ancient Civilizations. New York; Mayflower Books, 1980. 

Diehl, Richard A. Tula: The Toltec Capital of Ancient Mexico. London; Thames and Hudson, 1983. 

Hunter, Bruce C. A Guide to Ancient Mexican Ruins. University of Oklahoma Press, 1977. 

Pasztory, Esther.  Teotihuacan: An Experiment in Living. London; University of Oklahoma Press, 1997. 

Werner, Michael S. The Encyclopedia of México: History, Society & Culture.  Chicago; Fitzroy Dearborn Publishers, 1997. 

Links to other sites used: 

http://www.concentric.net/~yohon/coba.html  

http://www.azteca.net/~ecomaya/muldo.html 

http://www.mexicancaribbean.com/comdorinterest.html 

http://www.tulumresorts.com/resorts.com/resorts/tulum/ruins.html 

http://www.gorp/location/latamer/mexico/arc_maya.htm 

http://www.digiserve.com/magicmex/pre-colombian languages/nahuatl vocabulary.html 

http://www.highfiber.com/~nahualli/Quetzalcoatl.htm 

http://www.quetzalcoatl.com/serpent.html 

http://www.wohlmut.com/Maya/dziblch.html