Bigun, Igor. “The Raid of the Ivan Bogun Detachment to Chełm Land (May–July, 1944)”. Scientific Papers of the Vinnytsia Mykhailo Kotsyiubynskyi State Pedagogical University Series History, no. 33, Oct. 2020, pp. 44-54, https://doi.org/10.31652/2411-2143-2020-33-44-54.