MROZKOWIAK, Mirosław, BIBROWICZ, Karol, HADLICH, Roland, KURZEJA, Piotr and SZURMIK, Tomasz. Correlations and coexistence of characteristics describing body posture and feet in children of both sexes aged 4 to 6 years. Journal of Education, Health and Sport. Online. 6 May 2017. Vol. 7, no. 5, pp. 225-264. [Accessed 29 June 2025].