Kot, Kamila, Mirosław Kokosz, and Krystyna Stencel-Gabriel . “The Influence of Four-Month Exercises During Lessons on Body Posture in Children in Younger School Age”. Journal of Education, Health and Sport 8, no. 9 (September 12, 2018): 756–767. Accessed March 17, 2025. https://apcz.umk.pl/JEHS/article/view/5906.