Muhammad Donni, et al. “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), vol. 4, no. 7, June 2025, pp. 4019-25, doi:10.54443/ijset.v4i7.1281.