Cantú-Chapa, Abelardo. 2012. «The Suture Line Patterns in Olcostephanidae and Spiticeratidae, Ammonites of the Upper Jurassic-Lower Cretaceous: Systematic Considerations». Paleontología Mexicana 1 (1):58-72. https://doi.org/10.22201/igl.05437652e.2012.1.1.129.