	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;