Fitri, N., M. B. Satrio, A. Setiawan, M. Jaya, A. Danesa, and F. Perdima. “Analysis of Underhand Serve Ability in Volleyball Instruction for Grade XI Students at SMAN 1 Kepahiang”. Educative Sportive, Vol. 6, no. 2, July 2025, pp. 141-4, doi:10.33258/edusport.v6i2.12324.