Abou-Gamil, Essam Helmy. “The Effect of a Cross-Training Program on the Body Composition, the Physical Working Capacity and the Record Level of 5000m Runners”. Journal of Applied Sports Science 7, no. 3 (September 15, 2018). Accessed November 13, 2019. http://jass.alexu.edu.eg/index.php/JASS/article/view/214.