KWIATKOWSKA, W. The Service Sector in the Economy in Poland and European Union Countries. Olsztyn Economic Journal, [S. l.], v. 10, n. 3, p. 191–207, 2015. DOI: 10.31648/oej.3146. Disponível em: https://czasopisma.uwm.edu.pl/index.php/oej/article/view/3146. Acesso em: 27 nov. 2024.