Negendank, J. F. W., Emmermann, R., Krawczyk, R., Mooser, F., Tobschall, H. y Werle, D. J. (1985) «Geological and geochemical investigations on the eastern Trans-Mexican Volcanic Belt », Geofísica Internacional, 28(3), pp. 477–575. doi: 10.22201/igeof.00167169p.1989.28.3.623.