	Authors	Year	Title
	Miller	1938	Devonian ammonoids of America. Special Papers, Geological Society of America, 14: 1-262, fig.1-41, pl.1-39; Baltimore.
	Posser & Kindle	1913	Cephalopoda [of the Middle Devonian of Maryland]. Maryland Geological Survey, Middle and Upper Devonian: 307-326, pl.38-42; Baltimore.