Och, Jarosław. “Specific Aspects of European and Polish Migrations at the Begging of the 21st Century”. Journal of Geography, Politics and Society 9, no. 4 (December 31, 2019): 58-66. Accessed April 3, 2020. https://czasopisma.bg.ug.edu.pl/index.php/JGPS/article/view/3907.