	Authors	Year	Title
	Bisat	1924	The Carboniferous goniatites of the North of England and their zones. Proceedings of the Yorkshire Geological Society, 20: 40-124, pl.1-10; Leeds.
	Miller & Youngquist	1948	The cephalopod fauna of the Mississippian Barnett Formation of Central Texas. Journal of Paleontology, 22: 649-671, fig.1-3, pl.94-100; Tulsa, Okla.