Bonanno, Salvio, and Giuseppe Sirna. 2019. “Revision of Some Species of Cenomanian Caprinid Rudists Instituted by G. G. Gemmellaro in 1865”. Revista Mexicana De Ciencias Geológicas 12 (2):135-44. https://www.rmcg.unam.mx/index.php/rmcg/article/view/1172.