Authors	Year	Title
Miller & Collinson	1951	Lower Mississippian ammonoids of Missouri. Journal of Paleontology, 25: 454-487, fig.1-14, pl.68-71; Tulsa, Oklahoma.
Smith	1903	The Carboniferous Ammonoids of America. Monography, U.S. geological Survey, 42: 1-211, pl.1-29; Washington.
Swallow	1860	Descriptions of new fossils from the Carboniferous and Devonian rocks of Missouri. Transactions St. Louis Academy of Sciences, 1: 635-660, St. Louis.