	Authors	Year	Title
	Gordon	1965	Carboniferous Cephalopods of Arkansas. Professional Papers, U.S. Geological Survey, 460: 1-322, fig.1-96, pl.1-32; Washington. [imprint 1964].
	Manger, Miller & Mapes	1992	Age and Correlation of the Gene Autry Shale, Ardmore Basin, Southern Oklahoma. Oklahoma Geological Survey Circular, 94: 101-109, pl.1, 3 figs.
	McCaleb	1968	Lower Pennsylvanian Ammonoids from the Bloyd Formation of Arkansas and Oklahoma. Special Paper of the geological Society of America, 96: 1-123, fig.1-27, pl.1-12; Boulder,Colorado.
	Miller & Owen	1944	The cephalopod fauna of the Pennsylvanian Union Valley Formation of Oklahoma. Journal of Paleontology, 18 (5): 417-428,fig.1-4, pl.63-68; Tulsa, Okla.
	Miller & Furnish	1958a	Middle Pennsylvanian Schistoceratidae (Ammonoidea). Journal of Paleontology, 32 (2): 253-268, fig.1-9, pl.33-34; Tulsa,Oklahoma.
	Saunders, Manger & Gordon	1977	Upper Mississippian and lower and middle Pennsylvanian ammonoid biostratigraphy of Northern Arkansas. Oklahoma Geolological Survey Guidebook 18: 117-137, fig.1-2, tab.1-2, pl.1-6.
	Sheng	1987	Carboniferous ammonoids from the Jingyuan district, Gansu. Bull. Inst. Geol., Chinese Acad. Geol. Sci., 16: 143-193, fig.1-29, pl.1-5; Beijing.
	Smith	1903	The Carboniferous Ammonoids of America. Monography, U.S. geological Survey, 42: 1-211, pl.1-29; Washington.
	Unklesbay	1962	Pennsylvanian Cephalopods of Oklahoma. Bulletin of the Oklahoma Geological Survey, 96: 1-150, fig.1-16, tab.1-2, pl.1-19; Norman.