	Authors	Year	Title
	Gordon	1986	Late Kinderhookian (Early Mississippian) Ammonoids of the Western United States. Journal of Paleontology, Mem. 19: 1-36, fig.1-12, tab.1-6; Tulsa, Okla.
	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.