عبد القادر ا. ع. ا. and منير ا. ع. ا. (2020) “The Effect Of Special Exercises for Attention Concentration on Learning Overhead pass in volleyball for sophomore students of physical Education & Sport Sciences College”, Journal of Physical Education, 31(3), pp. 19–28. doi: 10.37359/JOPE.V31(3)2019.855.