Piekorz, Z. (2016) “Nadwaga a poziom gibkości dzieci szkolnych – raport z badań = Obesity and the level of flexibility in primary school pupils – a research report”, Journal of Education, Health and Sport, 6(9), pp. 451–459. Available at: https://apcz.umk.pl/JEHS/article/view/3858 (Accessed: 23 January 2025).