	Authors	Year	Title
	Bisat	1932	On some lower Sabdenian goniatites. Transactions of the Leeds Geological Association, 5: 27-36, pl.1-2; Kendal.
	Holdsworth	1965	The Namurian goniatite Nuculoceras stellarum (Bisat). Palaeontology, 8 (2): 226-230, pl.25; London.