Mrozkowiak, Mirosław, Karol Bibrowicz, Tomasz Szurmik, and Roland Hadlich. 2017. “Correlations and Coexistence of Characteristics Describing Body Posture and Feet in Children and Young People of Both Sexes Aged 7 to 13 Years”. Journal of Education, Health and Sport 7 (5):265-314. https://apcz.umk.pl/JEHS/article/view/4461.