Karpus, Zbigniew. “The Polish-Ukrainian Relations During the Formation Ot the Polish Eastern Border in the Years Between 1918-1922”. Torun International Studies 1, no. 2 (May 13, 2009): 5–18. Accessed July 17, 2024. https://apcz.umk.pl/TSM/article/view/TIS.2009.001.