Vasianovych, Hryhoriy, and Radosław Muszkieta. “Methodological Problems of Modern Pedagogy”. Pedagogy and Psychology of Sport 3, no. 1 (January 30, 2017): 4–15. Accessed December 4, 2024. https://apcz.umk.pl/PPS/article/view/PPS.2017.001.