	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.
	Kullmann	1992	Note on Beyrichoceras from Los Santos de Maimona (SW Spain). Coloquios de Paleontología, 44: 245-247, fig.39, pl.21; Madrid.