Ifrim, Christina, Wolfgang Stinnesbeck, and Armin Schafhauser. “Maastrichtian Shallow-Water Ammonites of Northeastern Mexico”. Revista Mexicana de Ciencias Geológicas 22, no. 1 (May 7, 2018): 48–64. Accessed May 2, 2025. https://www.rmcg.unam.mx/index.php/rmcg/article/view/873.