	Authors	Year	Title
	Elias	1938	Studies of Late Paleozoic ammonoids. Journal of Paleontology, 12 (1): 86-100, pl.19,20; Tulsa,Oklahoma.
	House	1985	Class Cephalopoda. In: Murray,J.W. (Ed.): Atlas of invertebrate macrofossils.- 114-152, fig.6.7.1-6.7.25, pl.6.7.1-6.7.127; New York.