	Authors	Year	Title
	House	1965	A study in the Tornoceratidae: the succession of Tornoceras and related genera in the North American Devonian. Phil. Transactions of the Royal Society of London, Ser.B Biological Science, No.763 Vol.250: 79-130, fig.1-19, pl.1-11; London.
	Trevin	1970	A dimorphic goniatite from the Namurian of Cheshire. Palaeontology, 13(1): 40-46, fig.1, pl.12; London.