Stępniak, Robert, Łukasz Pabianek, and Daria Ostrowska. “The Periodical Inspection in Training Young Players in ‘UKS Football School’ Chelmno”. Journal of Education, Health and Sport 7, no. 1 (January 26, 2017): 227–246. Accessed February 9, 2025. https://apcz.umk.pl/JEHS/article/view/4189.