FERRUSQUÍA-VILLAFRANCA, Ismael; APPLEGATE, Shelton P.; ESPINOSA-ARRUBARRENA, Luis. First Paleogene selachifauna of the middle American-Caribbean Antillean region, La Mesa de Copoya, west-central Chiapas, Mexico—Geologic setting. Revista Mexicana de Ciencias Geológicas, [S. l.], v. 17, n. 1, p. 1–23, 2018. Disponível em: https://www.rmcg.unam.mx/index.php/rmcg/article/view/1014. Acesso em: 6 may. 2025.