Olóriz, Federico, et al. “Middle Oxfordian Ammonite Biostratigraphy of the Lower Santiago Formation at Tamán, San Luis Potosí, Mexico — With Notes on Mexico-Caribbean Ochetoceratins”. Revista Mexicana De Ciencias Geológicas, vol. 25, no. 2, Jan. 2018, pp. 261-83, https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/658.