Ahmed Hassan Saber Al Kaabi. “The Relationship of Some Forms of Motor Coordination to the Accuracy of Serving and Hitting High Aces in Youth Volleyball”. Musamus Journal of Physical Education and Sport (MJPES), Vol. 1, no. 4, Dec. 2025, pp. 1-16, https://ejournal.unmus.ac.id/index.php/physical/article/view/7244.