Authors Year Title
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.
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.
Ruzhencev 1950 Verkhnekamennougol'nye ammonity Urala.
Trudy Paleont. Inst., Akad. Nauk SSSR, 29: 1-220, fig.1-84, pl.1-15; Moskva.
Ruzhencev 1952 Biostratigrafiya Sakmarskogo Yarusa v Aktyubinskoy Oblasti Kazakhskoy SSR.
Trudy Paleontologicheskogo Instituta Akademiya Nauk SSSR, 42: 1-87, fig.1-28, pl.1-6; Moskva.