John F. Schwaller, "The Fifteenth Month: Aztec History in the Rituals of Panquetzaliztli", 2019, Norman, University of Oklahoma Press. En Estudios de Cultura Náhuatl, 2020, n. 59, pp. 255-271. Elena Mazzetto

https://www.academia.edu/44624094/John_F_Schwaller_The_Fifteenth_Month_Aztec_History_in_the_Rituals_of_Panquetzaliztli_2019_Norman_University_of_Oklahoma_Press_En_Estudios_de_Cultura_N%C3%A1huatl_2020_n_59_pp_255_271