ETAYO SERNA, F. Faunas position in the Colombian Cretaceous deposits and their value in their chronological subdivision. Boletín de Geología, [S. l.], n. 16-17, p. 5–142, 1964. Disponível em: https://revistas.uis.edu.co/index.php/revistaboletindegeologia/article/view/5783. Acesso em: 17 may. 2024.