This document, often called the Florentine Codex, is currently located in the Biblioteca Medicea Laurenziana, Florence, Italy. Facsimile edition: Sahagún, Bernardino de. 1979. Códice florentino. 3 vols. México: Secretaría de Gobernación. Book 12, Chapter 16, fol. 24v-25v. The Nahuatl, and its English translation have been published in Sahagún, Bernardino de. 1959-1982 [1565-1580]. Historia general de las cosas de Nueva España, vol. 12. A.J.O. Anderson and Charles Dibble, eds. and trans. Salt Lake City, Utah and Santa Fe, New Mexico: University of Utah Press and School of American Research, p. 44.
To read more:
Carrasco, Davíd. 1982. Quetzalcoatl and the Irony of Empire: Myths and Prophecies in the Aztec Tradition. Chicago, Illinois and London: University of Chicago Press.
Gruzinski, Serge. 1993. The Conquest of Mexico: The Incorporation of Indian Societies into the Western World, 16th-18th centuries. Cambridge, Massachusetts: Polity Press.
León Portilla, Miguel. 2002. Bernardino de Sahagún: First Anthropologist. Trans. Mauricio J. Mixco. Norman, Oklahoma: University of Oklahoma Press.