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Korobkov, I.A. (1949). Class Gastropoda in A.N. Ryabinin & I.A. Korobkov (eds), Atlas rukovodyashchikh form iskopaemÿkh faun SSSR [Atlas of the guide forms of the fossils faunas of the USSR] vol. XII. Paleogene, 231-269. "Gosgeolizdat" Publ. House, Moscow.
Korobkov, I.A. (1949). Class Gastropoda in A.N. Ryabinin & I.A. Korobkov (eds), Atlas rukovodyashchikh form iskopaemÿkh faun SSSR [Atlas of the guide forms of the fossils faunas of the USSR] vol. XII. Paleogene, 231-269. "Gosgeolizdat" Publ. House, Moscow.