	Authors	Year	Title
	Bisat	1924	The Carboniferous goniatites of the North of England and their zones. Proceedings of the Yorkshire Geological Society, 20: 40-124, pl.1-10; Leeds.
	Bisat	1934b	Anthracoceras from the E2 Zone of the Namurian. Transactions of the Leeds Geologists Association, 5: 112-117, fig.1-3; Kendal.