^A volte l'anno di nascita viene indicato come 1398; vedi Mann, Charles C. (2005) 1491: New Revelations of the Americas Before Columbus, Knopf, New York, p. 118, ISBN 1-4000-4006-X
^Vincent H. Malmstrom, Cycles of the Sun, Mysteries of the Moon: The Calendar in Mesoamerican Civilization, 1997, University of Texas Press, Austin (Texas), p. 238, ISBN 0-292-75196-6