1. Acuña-Soto, R., D.W. Stahle, M.K. Cleaveland, and M.D. Therrell. 2002. Megadrought and megadeath in 16th Century Mexico. Emerging Infectious Diseases 8: 360–362.
2. Aguilar-Moreno, M. 2007. Handbook to life in the Aztec world. New York: Oxford University Press.
3. Berdan, F.F. 1975. Trade, tribute, and market in the Aztec empire. Ph.D. Thesis. Department of Anthropology. Austin: University of Texas.
4. Berdan, F.F. 1980. Aztec merchants and markets: Local-level economic activity in a non-industrial empire. Mexicon 2: 37–41.
5. Berdan, F.F. 1985. Markets in the economy of Aztec Mexico. In Markets and marketing. Monographs in Economic Anthropology, ed. S. Plattner, vol. 4, 339–367. Lanham: University Press of America.