Andrushchak, Roman. “Theoretical Principles of Soviet Anti -Catholic Policy in the 1920s”. Scientific Papers of the Vinnytsia Mykhailo Kotsyiubynskyi State Pedagogical University Series History, no. 25, Nov. 2017, pp. 284-7, https://doi.org/10.31652/2411-2143-2017-25-284-287.