WIERZBICKA, W. Return on Sales for Companies in Eastern Poland. Olsztyn Economic Journal, [S. l.], v. 10, n. 4, p. 373–384, 2015. DOI: 10.31648/oej.3159. Disponível em: https://czasopisma.uwm.edu.pl/index.php/oej/article/view/3159. Acesso em: 5 may. 2024.