Ferrusquia-Villafranca, I. & Applegate, S.P. & Espinosa-Arrubarrena, L. (2000)
First Paleogene Selachifauna of the Middle American-Caribbean-Antillean Region, La Mesa de Copoya, West-Central Chiapas - Geologic Setting. Revista Mexicana de Ciencias Geológicas, 17(1), 1–23

Ferrusquia-Villafranca, I. & Applegate, S.P. & Espinosa-Arrubarrena, L. (1999)
First Paleogene Selachifauna of the Middle American-Caribbean-Antillean Region, La Mesa de Copoya, West-Central Chiapas, Mexico - Systematics and Paleontological Significance. Revista Mexicana de Ciencias Geológicas, 16(2), 155–174