	Authors	Year	Title
	Becker	2002	Alpinites and other Posttornoceratidae (Goniatitida, Famennian). Mitteilungen des Museums für Naturkunde Berlin, Geowissenschaftliche Reihe, 5 (002): 51-73, 6 fig., 1 tab., 3 pl., Berlin.
	Selwood	1960	Ammonoids and Trilobites from the Upper Devonian and lowest Carboniferous of the Launceston area of Cornwall. Palaeontology, 3 (2): 153-185, fig.1-8, pl.26-29; London.