Filatov, Sergei; Shchipkov, Aleksandr. Religious Developments among the Volga Nations as a Model for the Russian Federation. Religion, State Society, Vol. 23, No. 3, 1995. pp. 239–243 Valentin Stetsyuk. Introduction to the Study of Prehistoric Ethnogenic Processes in Eastern Europe and Asia, The Turkic Tribe Bulgar in Eastern Europe. Lviv, Ukraine. Schnirelman, Victor: “Christians! Go home”: A Revival of Neo-Paganism between the Baltic Sea and Transcaucasia. Journal of Contemporary Religion, Vol. 17, No. 2, 2002. Marc Ira Hooks. The Chuvash People - An Ethnographic Study & Missiological Strategy Analysis. Engage Russia.
 Valentin Stetsyuk. Introduction to the Study of Prehistoric Ethnogenic Processes in Eastern Europe and Asia, The Turkic Tribe Bulgar in Eastern Europe. Lviv, Ukraine. Marc Ira Hooks. The Chuvash People - An Ethnographic Study & Missiological Strategy Analysis. Engage Russia.
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Filatov, Sergei; Shchipkov, Aleksandr. Religious Developments among the Volga Nations as a Model for the Russian Federation. Religion, State
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Society, Vol. 23, No. 3, 1995. pp. 239–243
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Schnirelman, Victor: “Christians! Go home”: A Revival of Neo-Paganism between the Baltic Sea and Transcaucasia. Journal of Contemporary Religion, Vol. 17, No. 2, 2002.