	Authors	Year	Title
	Bisat	1934	The goniatites of the Beyrichoceras zone in the north of England. Proceedings of the Yorkshire Geological Society, 22: 280-309, fig.1-27, pl.17-24; Leeds.
	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.