Detynych, S. “Comparative Overview of Functional and Motor Preparedness of Boys Aged 13-14”. Teorìâ ta Metodika Fìzičnogo Vihovannâ 19, no. 2 (June 25, 2019): 89-97. Accessed December 5, 2019. https://www.tmfv.com.ua/journal/article/view/1268.