19°14′44″N 99°13′22″W / 19.24556°N 99.22278°W / 19.24556; -99.22278
Siebe C. (2000). "Age and archaeological implications of Xitle volcano, southwestern Basin of Mexico-City" (PDF). Journal of Volcanology and Geothermal Research. 104 (1–4): 45–64. CiteSeerX 10.1.1.535.6515. doi:10.1016/S0377-0273(00)00199-2. http://www.geo.mtu.edu/EHaz/ConvergentPlatesClass/Chichinautzin/Siebe-xitle.pdf ↩
Susan Toby Evans, David L. Webster, eds, Archaeology of Ancient Mexico and Central America: An Encyclopedia. Routledge, 2013 ISBN 1136801855 p76 https://books.google.com/books?id=vZ3DAAAAQBAJ&pg=PA76 ↩