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 . International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET), [S. l.], v. 4, n. 7, p. 4019–4025, 2025. DOI: 10.54443/ijset.v4i7.1281. Disponível em: https://ijset.org/index.php/ijset/article/view/1281. Acesso em: 28 apr. 2026.