Kryvoruchko, Oleksandr. “The Question of the Catholicity of the Ukrainian Lands in International Relations 1918 - 1919”. Scientific Papers of the Vinnytsia Mykhailo Kotsyiubynskyi State Pedagogical University Series History, no. 28, May 2019, pp. 25-29, https://doi.org/10.31652/2411-2143-2019-28-25-29.