	Authors	Year	Title
	Davis, Furnish & Glenister	1969	Mature Modification and Dimorphism in late Paleozoic Ammonoids. In: Westermann,G.E.G:Sexual Dimorphism in Fossil Metazoa and Taxonomic Implications,Intern.Union Geol.Sci., A (1):101-110, 2 figs., pl.2-5, Stuttgart.