Authors	Year	Title
Hodson	1957	Marker horizons in the Namurian of Britain, Ireland, Belgium and Western Germany. Association pour l'Etude de Paléontologie et de la Stratigraphie Houillères, Publication 24: 1-26, fig.1-3, pl.1-7; Bruxelles.
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.
Quinn & Saunders	1968	The ammonoids Hudsonoceras and Baschkirites in the Morrowan series of Arkansas. Journal of Paleontology, 42; 397-402, fig.1-3, pl.57; Tulsa, Okla.