Semple, S., N. Neveling, and R. Roussouw. “Physical and Performance-Related Profile of Elite Male South African Distance Runners”. African Journal for Physical Activity and Health Sciences 9, no. 2 (February 6, 2004): 238–249. Accessed October 6, 2026. https://www.ajol.info/index.php/ajpherd/article/view/24630.