García-Palomo, A., Macías, J. L., Tolson, G., Valdez, G. y Mora, J. C. (2002) «Volcanic stratigraphy and geological evolution of the Apan region, east-central sector of the Trans-Mexican Volcanic Belt», Geofísica Internacional, 41(2), pp. 133–150. doi: 10.22201/igeof.00167169p.2002.41.2.282.