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].
Mather	1915	The fauna of the Morrow group of Arkansas and Oklahoma. Bull. Denison Univ. Sci. Lab., 18 (3): 59-284, pl.1-16;
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.