Umam, A. ., Putri, S. A. R. ., Lestari, H. ., Handayani, W., & Lanos, M. E. C. . (2026). The Effectiveness of a Volleyball Teaching Model in Enhancing Underhand Service Skills Among Junior Secondary School Students . Indonesian Journal of Physical Education and Sport Science, 6(3), 711-722. https://doi.org/10.52188/ijpess.v6i3.2202