	Authors	Year	Title
	Miller & Warren	1933	A Propinacoceras from North America. American Journal of Science, 153: 295-299, fig.1-4; New Haven.
	Nassichuk	1977	Upper Permian ammonoids from the Cache Creek Group in Western Canada. Journal of Paleontology, 51 (3): 557-590, fig.1-20, tab.1-7, pl.1-3; Tulsa, Okla.