	Authors	Year	Title
	Mapes, Windle & Sturgeon	1997	Pennsylvanian Cephalopods of Ohio. Part 2. Ammonoid Cephalopods. [Mapes, R.H., Windle, D.L., Sturgeon, M.T. & Hoare, R.D., 1997.] Ohio Division of Geological Survey, Bulletin 71: 193-260, 7 pls., 32 figs., Columbus, OH.
	Miller & Downs	1950a	Ammonoids of the Pennsylvanian Finis Shale of Texas. Journal of Paleontology, 24:185-218, 11 text-figs., pl.31-35.
	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.
	Unklesbay	1962	Pennsylvanian Cephalopods of Oklahoma. Bulletin of the Oklahoma Geological Survey, 96: 1-150, fig.1-16, tab.1-2, pl.1-19; Norman.