	Authors	Year	Title
	Manger & Quinn	1972	Carboniferous dimorphoceratid ammonoids from northern Arkansas. Journal of Paleontology, 46: 303-314, fig.1-4, pl.1-2; Tulsa, Okla.
	Manger & Pareyn	1979	New Carboniferous dimorphoceratid ammonoids from Algeria and Arkansas. Journal of Paleontology, 53 (3): 657-665, fig.1-3, pl.1.