	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.
	Kyuma & Nishida	1987	Akiyoshiceras, A New Neoicoceratid Ammonoid Genus from the Upper Carboniferous of Akiyoshi. Bulletin of the Akiyoshi-dai Museum of Natural History, 22: 23-41, 8 figs., 3 tabls., 5 pls., Shuho.
	Loon	1971	The stratigraphy of the Wastphalian C around Prioro (Prov. Leon, Spain). Trab. geol., 3: 231-265, fig.1-7, pl.1-8; Oviedo.