	Authors	Year	Title
	Bisat & Hudson	1943	The lower Reticuloceras (R1) goniatite succession in the Namurian of the North of England. Proceedings of the Yorkshire Geological Society, 24 (6): 383-440, fig.1, pl.23-30; Wakefield.
	Bouckaert & Owodenko	1965	Namurian Goniatite succession in the Coalfield of Djerada (Eastern Morocco). Bulletin de la Societé belge de Géologie, Paléontologie et Hydrologie, 73: 454-463, fig.1-2, pl.1-2; Bruxelles.