PROSKURA, P.; WITKOWSKI, K. The law on sport in the light of the opinion of the fitness instructors and personal trainers. Quality in Sport, [S. l.], v. 3, n. 1, p. 36–47, 2017. DOI: 10.12775/QS.2017.004. Disponível em: https://apcz.umk.pl/QS/article/view/QS.2017.004. Acesso em: 29 mar. 2024.