	Authors	Year	Title
	Davis & Mapes	1996	Fossils of Ohio. Phylum Mollusca, Class Cephalopoda. Ohio Division of Geological Survey, Bulletin 70, Fossils of Ohio, Chapter 14: 166-195, Fig.14-1 - Fig.14-10, Columbus, OH.
	Mapes, Windle & Sturgeon	1997	Pennsylvanian Cephalopods of Ohio. Part 2. Ammonoid Cephalopods. [Mapes, R.H., Windle, D.L., Sturgeon, M.T. & Hoare, R.D., 1997.] Ohio Division of Geological Survey, Bulletin 71: 193-260, 7 pls., 32 figs., Columbus, OH.
	Miller & Unklesbay	1942	The cephalopod fauna of the Conemaugh Series in Western Pennsylvania. Annals of the Carnegie Museum, 29: 127-174, fig.1-5, pl.1-8; Pittsburgh, Pa.
	Work, Boardman & Mapes	2007	The Upper Pennsylvanian (Missourian) Ammonoid Pennoceras from the North Midcontinent. Journal of Paleontology, 81: 591-596, 6 fig.