Kravchuk, Oleksandr, and Liudmyla Kravchuk. “Ukrainian Idea of Ihor Hubarzhevskyi”. Scientific Papers of the Vinnytsia Mykhailo Kotsyiubynskyi State Pedagogical University Series History, no. 30, Dec. 2019, pp. 79-85, https://doi.org/10.31652/2411-2143-2019-30-79-85.