Sever, O., R. Kır, and M. Yaman. “The Impact of Periodized Core Training Program on Accurate Service Velocity of Male Tennis Players Aged 11-13<p≫11-13 Yaş Arası Erkek tenisçilerde periyotlanmış Core Antrenman programının Isabetli Servis hızına Etkisi”. Journal of Human Sciences, vol. 14, no. 3, Oct. 2017, pp. 3022-30, https://www.j-humansciences.com/ojs/index.php/IJHS/article/view/4760.