Orel – the Catholic physical education association: foreign relations up to 1929. Sport i Turystyka Środkowoeuropejskie Czasopismo Naukowe, [S. l.], v. 4, n. 1, p. 11–31, 2021. DOI: 10.16926/sit.2021.04.01. Disponível em: https://czasopisma.ujd.edu.pl/index.php/sport/article/view/1213. Acesso em: 22 sep. 2026.