Makarczuk, Anna Krystyna, and Michał Kowalewski. “Physical Activity and Body Posture of Younger School Children in the Opinion of Parents”. Journal of Education, Health and Sport 10, no. 12 (December 20, 2020): 138–150. Accessed November 26, 2024. https://apcz.umk.pl/JEHS/article/view/JEHS.2020.10.12.013.