Muhammad Donni, Ladipin, Afrizal. A COMPREHENSIVE SURVEY ON THE PROFICIENCY OF UNDERHAND SERVING SKILLS AMONG EIGHTH-GRADE FEMALE STUDENTS IN THE VOLLEYBALL EXTRACURRICULAR PROGRAM AT SMP NEGERI 6 LAWE SIGALA-GALA . IJSET [Internet]. 2025 Jun. 29 [cited 2026 Apr. 28];4(7):4019-25. Available from: https://ijset.org/index.php/ijset/article/view/1281