“The Effectiveness of Project Based Learning (PJBL) in Improving Volleyball Upper Passing: A Case Study at SMP Negeri 3 Satu Atap”. Journal Coaching Education Sports 6, no. 1 (May 26, 2025): 48–59. Accessed June 4, 2025. https://ejurnal.ubharajaya.ac.id/index.php/JCESPORTS/article/view/3831.