	Authors	Year	Title
	Elias	1938	Studies of Late Paleozoic ammonoids. Journal of Paleontology, 12 (1): 86-100, pl.19,20; Tulsa,Oklahoma.
	Smith	1903	The Carboniferous Ammonoids of America. Monography, U.S. geological Survey, 42: 1-211, pl.1-29; Washington.