Hugh Tomas, Conquest: Cortes,Montezuma and the Fall of Old Mexico (New York: Simon & Schuster, 1993), 443–446; Rodolfo Acuna-Soto et al., ‘Megadrought and Megadeath in 16th Century Mexico’, Historical Review 8:4 (2002), 360–362; Sherburne F. Cook and Lesley Byrd Simpson, The Population of Central Mexico in the Sixteenth Century (Berkeley: University of Califronia Press, 1948).
