	Authors	Year	Title
	Bisat	1952	The goniatite succession at Cowdale Clough, Barnoldswick, Yorkshire. Transactions of the Leeds Geologists Association, 6 (4): 155-181, fig.1-3, pl.1-3; Kendal.
	Moore	1946	The Carboniferous goniatite genera Girtyoceras and Eumorphoceras. Proceedings of the Yorkshire Geological Society, 25: 387-445, 31 figs., pl.22-27; Wakefield.