Brzeziński, Andrzej 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 (styczeń). https://doi.org/10.12775/SDR.2013.21.