	Authors	Year	Title
	Miller & Cline	1934	The cephalopod fauna from the Pennsylvanian Nellie Bly Formation of Oklahoma. Journal of Paleontology, 8 (2): 171-185, pl.28; Tulsa, Oklahoma.
	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.