Kędzia, Piotr. “Ethical Aspects of the Work of a Personal Trainer”. In Physical Education, Sport and Olympism from a Pedagogical Perspective, edited by Jolanta E. Kowalska and Arkadiusz Kaźmierczak, 221–229. Poland: Lodz University Press, 2023. Accessed January 25, 2026. https://www.press.uni.lodz.pl/index.php/wul/catalog/book/592/chapter/1589.