M. Kildeyev, “The Level of Muslim Religiosity in the Middle Volga and Ural Regions According to Soviet Sociological Surveys (1966-1991)”, State, Religion and Church, vol. 32, no. 1, pp. 131–150, Jan. 2014, Accessed: Nov. 08, 2026. [Online]. Available: https://state-religion-church.owebs.ru/article/view/10756