Y. Thanoon, mutaz, O. S. Thanoon, and M. H. Younis. “The Effect of Exercise With More Than One Ball on a Number of Physical Attributes of the Players of Youth Football”. College of Basic Education Research Journal, vol. 12, no. 2, June 2013, pp. 573-96, https://stats.uomosul.edu.iq/index.php/berj/article/view/39590.