Authors	Year	Title
Clarke & Swartz	1913	Cephalopoda [of the Upper Devonian of Maryland]. Maryland Geological Survey, Middle and Upper Devonian: 690-699, pl.51,52; Baltimore.
Miller	1938	Devonian ammonoids of America. Special Papers, Geological Society of America, 14: 1-262, fig.1-41, pl.1-39; Baltimore.
Münster	1832	Ueber die Planuliten und Goniatiten im Uebergangs-Kalk des Fichtelgebirges. 1-38, pl.1-6; Bayreuth (Birner).