Arce, José Luis, et al. “Bosque De Tlalpan Pumice, Product of a Large-Magnitude Eruption at the Southwestern Margin of the Mexico Basin”. Revista Mexicana De Ciencias Geológicas, vol. 34, no. 3, Nov. 2017, pp. 274-88, doi:10.22201/cgeo.20072902e.2017.3.485.