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