Kowalewska, Grażyna, Joanna Nieżurawska-Zając, and Nelson Duarte. “Causes and Directions of Student Migration Using Polish and Portugese Students As an Example”. Olsztyn Economic Journal 14, no. 3 (September 10, 2019): 271–286. Accessed April 25, 2024. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/4373.