GARCÍA-BARRERA, Pedro. Toucasia hancockensis (Hippuritacea-Requienidae) in southwestern Mexico. Revista Mexicana de Ciencias Geológicas, [S. l.], v. 12, n. 2, p. 191–194, 2019. Disponível em: https://www.rmcg.unam.mx/index.php/rmcg/article/view/1191. Acesso em: 11 may. 2025.