WYSZYŃSKI, A. Efficiency of Football Clubs in Poland. Olsztyn Economic Journal, [S. l.], v. 11, n. 1, p. 59–72, 2016. DOI: 10.31648/oej.2902. Disponível em: https://czasopisma.uwm.edu.pl/index.php/oej/article/view/2902. Acesso em: 9 apr. 2025.