Qassim Mohammed Salih, et al. “The Impact of the Preparatory Games Program on the Development of Some Physical Attributes and Basic Skills for the Effectiveness of Running 100 M and Long Jump for Primary School Students”. Modern Sport, vol. 18, no. 1, Mar. 2019, pp. 575-86, https://jcopew.uobaghdad.edu.iq/index.php/sport/article/view/1552.