Brzeziński, A.M. 2013. Oskar Halecki – the advocate of Central and Eastern European countries in the International Committee on Intellectual Cooperation of the League of Nations (1922‑1925). Studia z Dziejów Rosji i Europy Środkowo-Wschodniej. 48, (sty. 2013). DOI:https://doi.org/10.12775/SDR.2013.21.