Cieśla, E. (2012) “Physical Fitness of Six and Seven-Year Old Children and Its Environmental Determinants”, INSTED: Interdisciplinary Studies in Education & Society, 15(3(59), pp. 93–110. Available at: https://insted-tce.pl/ojs/index.php/tce/article/view/215 (Accessed: 8 June 2025).