	Authors	Year	Title
	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.