Authors Year Title
Fujikawa & Ishibashi 1999 Carboniferous and Permian Ammonoids from Northern Thailand (Paleontological Study of Paleozoic Cephalopods in Southeast Asia - 1).
Memoirs of the Faculty of Science, Kyushu University, Series D, 30 (3): 91-110, 11 fig.,  pl.2-3, Fukuoka.