	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.
	Ruzhencev	1955b	K voprosu o proiskhozhdenii semeystva Shumarditidae. Dokl. Akad. Nauk SSSR, 103 (6): 1107-1110, fig.1-2; Moskva.
	Wagner-Gentis	1971	Some goniatites from Westphalian D (Upper Moscovian) strata in Northern Palencia, Spain. Trab. geol., 4: 665-675, fig.1-7, pl.1-2; Oviedo.