	Authors	Year	Title
	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.
	Hudson	1946	The Namurian goniatites Cravenoceratoides bisati Hudson and Ct. lirifer n.sp. Proceedings of the Yorkshire Geological Society, 25 (6): 375-386, pl.21,21A; Wakefield.