	Authors	Year	Title
	Boardman, Work & Mapes	1994	Biostratigraphy of Middle and Late Pennsylvanian (Desmoinesian-Virgilian) ammonoids. [Boardman,D.R., D.M.Work, Mapes,R.H. & Barrick,J.E.]. Kansas Geological Survey Bulletin 232, 121 p., 26 figs., 1 tabl., 5 pls., Lawrence, KS.
	Bogoslovskaya & Popov	1986	Ammonoidei na granitse karbona i permi. [In Russian: Ammonoids at the boundary of Carboniferous and Permian.] In: Papulov,G.N. [ed.], Pogranichnye otlozheniya karbona i permi Urala, Priural'ya i Srednei Azii. Biostratigrafiya i korrelyatsiya. 56-63, tab.2-3.
	Bogoslovskaya, Leonova & Shkolin	1995	The Carboniferous-Permian boundary and ammonoids from the Aidaralesh section, southern Urals. Journal of Paleontology 69: 288-301, 12 figs., Lawrence, KS.
	Nassichuk	1971	Permian ammonoids and nautiloids, Southeastern Eagle Plain, Yukon Territory. Journal of Paleontology, 45 (6): 1001-1021, fig.1-12, tab.1-3, pl.124-126; Tulsa,Oklahoma.
	Ruzhencev	1938	Ammonei Sakmarskogo yarusa i ikh stratigraficheskoe znachenie. Problemy Paleontologii, 4: 187-285, fig.1-19, pl.1-7; Moskva.
	Ruzhencev	1951	Nizhnepermskie ammonity yuzhnogo Urala. 1.Ammonity Sakmarskogo Yarusa. Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 33: 1-186, fig.1-62, phot.1-8, pl.1-15; Moskva.
	Sheng	1981	Late Carboniferous Ammonites from Northern Tianshan, Xinjiang. Bulletin Inst. Geol., Chines. Acad. Geol. Sci., 3: 83-96, fig.1-8, pl.1; Beijing.
	Tasch	1953b	Nautiloids and ammonoids of the Pennsylvanian "Dry Shale Fauna". Journal of Paleontology, 27 (3): 445-450, fig.1-3, pl.50; Tulsa,Oklahoma.