ESTEP, John W.; LUCAS, Spencer G.; GONZÁLEZ-LEÓN, Carlos M. Middle Triassic ammonites from Sonora, México. Revista Mexicana de Ciencias Geológicas, [S. l.], v. 14, n. 2, p. 155–159, 2018. Disponível em: https://rmcg.unam.mx/index.php/rmcg/article/view/1117. Acesso em: 15 mar. 2025.