Popieliński, Paweł. “Ethnicity and Nationality of the Indigenous Population of Upper Silesia After 1989”. Poznańskie Studia Slawistyczne, no. 8 (January 1, 2015): 137–151. Accessed July 16, 2024. https://pressto.amu.edu.pl/index.php/pss/article/view/2514.