	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.
	Nassichuk & Spinosa	1972	Early Permian (Asselian) ammonoids from the Hare Fiord Formation, Northern Ellesmere Island. Journal of Paleontology, 46 (4): 536-544, fig.1-5, tab.1-3, 1pl.; Tulsa, Okla.