	Authors	Year	Title
	Davis	1972	Mature modifications and dimorphism in selected Late Paleozoic ammonoids. Bulletins of American Paleontology, 62 (272): 27-130, pls.3-21, Ithaca, NY.
	Frech	1897-	Lethaea geognostica oder Beschreibung und Abbildung der für die Gebirgs-Formationen bezeichnendsten Versteinerungen. I. Theil. Lethaea palaeozoica. 2. Band. 35pls, 6maps, 551figs.; Stuttgart.
	Frest, Glenister & Furnish	1981	Pennsylvanian--Permian Cheiloceratacean Ammonoid Families Maximitidae and Pseudohaloritidae. Journal of Paleontology, 55, Suppl. 3: 1-46, fig.1-19, pl.1-7; Tulsa, Okla.
	Gemmellaro	1888	La Fauna dei Calcari con Fusulina della valle del Fiume Sosio (nella Provincia di Palermo). Appendice. Giornale di Scienze naturali ed economiche, 20, 9-36, pl.A-D; Palermo [1890].
	Miller & Unklesbay	1943	The siphuncle in Late Paleozoic amonoids. Journal of Paleontology, 17 (1): 1-25, fig.1-9, pl.1-5; Tulsa,Oklahoma.
	Miller & Furnish	1957b	Permian ammonoids from Southern Arabia. Journal of Paleontology, 31 (6): 1043-1051, fig.1-6, pl.131-132; Tulsa,Oklahoma.