Piperno, Dolores R., Moreno, Jorge Enrique, Iriarte, Jose, Holst, Irene, Lachniet, Matthew S., Jones, John G., Ranere, Anthony J., and Castanzo, R. 2007. "
Late Pleistocene and Holocene environmental history of the Iguala Valley, Central Balsas Watershed of Mexico."
Proceedings of the National Academy of Sciences of the United States of America, 104, (29) 11874–11881.
https://doi.org/10.1073/pnas.0703442104.