Stopchak, Mykola. “The Policy of Poland and Romania Concerning Interned Army of the Ukrainian People’s Republic (1921–1924s): Modern Domestic Historiography”. Scientific Papers of the Vinnytsia Mykhailo Kotsyiubynskyi State Pedagogical University Series History, no. 35, Mar. 2021, pp. 118-29, https://doi.org/10.31652/2411-2143-2021-35-118-129.