Nurrahman, Taufik, Aluwis Aluwis, and Muhammad Prawibowo. “Analysis of Underhand Serve Ability in Volleyball Game Among Extra-Curricular Students at Bahrul Ulum Islamic Boarding School, Pasir Utama, Rokan Hulu Regency”. Jurnal Ilmu Keolahragaan 1, no. 2 (March 13, 2026): 19–27. Accessed April 1, 2026. https://ojs.ucp.ac.id/index.php/JIKor/article/view/69.