Zell, Patrick, and Wolfgang Stinnesbeck. “Kimmeridgian (Late Jurassic) Cold-Water Idoceratids (Ammonoidea) from Southern Coahuila, Northeastern Mexico, Associated With Boreal Bivalves and Belemnites”. Revista Mexicana de Ciencias Geológicas 32, no. 1 (April 8, 2015). Accessed May 2, 2025. https://www.rmcg.unam.mx/index.php/rmcg/article/view/271.