1. Tret’yakov, P.N., The Origin of Chuvashes in the Light of Archeological Data, Sov. Etnografiya, 1950, no. 3, pp. 153–156.
2. Egorov, V.G., The Issues of the Origin of Chuvashes and Their Language, in Zapiski (Notes), Cheboksary: Chuvash Nauchn.-Issled. Inst. Yazyka i Literatury, 1953, no. 7.
3. Busygin, E.P. and Zorin, N.V., Ethnography of the Peoples of the Middle Volga Region, in Arkheologiya i etnografiya Tatarii (Archeology and Ethnography of Tataria), Kazan, 1984, issue. 5.
4. Kakhovskii, V.F., Mikhailov, S.M., and Fokin, P.P., Arkheologiya i etnografiya Chuvashskoi ASSR: Bibliograficheskii ukazatel’ (Archeology and Ethnography of Chuvash ASSR: Bibliographic Guide), in Trudy Chuvashskogo Nauchno-Issledovatelskogo Instituta Yazyka i Literatury (Proceedings of Chuvash Research Institute of Language and Literature), Cheboksary, 1986, issue 90.
5. Kakhovskii, V.F., The Origin of Chuvashes, Doctoral (Hist.) Dissertation,, Moscow: Research Institute of Language, Literature, History, and Economics, Council of Ministers of Chuvash ASSR, 1968, p. 300.