Jurkowski, Roman. 2018. „Is Every Pole a Catholic? – the Borderland Quandaries of Nationality and Religion Faced by Russian Bureaucracy in a 1910 Ministry of Internal Affairs Document”. Studia Z Dziejów Rosji I Europy Środkowo-Wschodniej 52 (2):205-20. https://doi.org/10.12775/SDR.2017.EN2.07.