Nixon, G. T., Demant, A., Armstrong, R. L. y Harakal, J. E. (1987) «K-ar and geologic data bearing on the age and evolution of the Trans-Mexican Volcanic Belt», Geofísica Internacional, 26(1), pp. 109–158. doi: 10.22201/igeof.00167169p.1987.26.1.1191.