	Authors	Year	Title
	Miller & Williams	1945	Permian cephalopods from Northern Columbia. Journal of Paleontology, 19 (4): 347-349, fig.1, pl.51; Tulsa,Oklahoma.
	Williams	1943	Stratigraphy and fauna of the Louisiana limestone of Missouri. Professional Papers, U.S. Geological Survey, 203: 1-1333, pl.1-9;