Tariq, Mohammed, and Abed al razaq Kadhim. “The Effect Of Compound Exercises On Developing Some Physical Fitness and Cognitive Components on First Class Soccer Referees’”. Journal of Physical Education, vol. 31, no. 3, Sept. 2019, pp. 104-16, https://doi.org/10.37359/JOPE.V31(3)2019.865.