Authors Year Title
Furnish & Knapp 1966 Lower Pennsylvanian fauna from  Eastern Kentucky; Part 1, Ammonoids.
Journal of Paleontology, 40: 296-308, fig.1-5, pl.35; Tulsa, Okla.
Manger & Saunders 1980 Lower Pennsylvanian (Morrowan) ammonoids from the North American midcontinent.
Journal of Paleontology, 54, Suppl.(3): 1-56, fig.1-21, pl.1-6, tab.1-10; Tulsa, Okla.
Miller & Faber 1892 Description of some Subcarboniferous and Carboniferous Cephalopoda.
Journal of the Cincinnati Society of natural history, 14: 164-168, pl.6;
Plummer & Scott 1937 Upper Paleozoic ammonites in Texas.
The geology of Texas, vol.3 pt.1, Bull. Texas. Univ., 3701: 1-516, fig.1-88, pl.1-41; Austin, Texas.
Smith 1903 The Carboniferous Ammonoids of America.
Monography, U.S. geological Survey, 42: 1-211, pl.1-29; Washington.