SkibiÅ„ski, Andrzej, and Andrzej RÄ…czaszek. “Economic and Demographic Effects of External Migration in Poland and Slovakia - Some Aspects”. European Journal of Sustainable Development 6, no. 3 (October 1, 2017): 129. Accessed November 23, 2024. https://ecsdev.org/ojs/index.php/ejsd/article/view/507.