Gelen, Ertuğrul, Sami Mengütay, and Mustafa Karahan. “Analysing Physical Fitness and Biomechanical Factors That Determine Tennis Serve Performance”. Journal of Human Sciences 6, no. 2 (November 2, 2009): 666–682. Accessed May 8, 2024. https://www.j-humansciences.com/ojs/index.php/IJHS/article/view/979.