Polmer Siagian. “Efforts to Improve Student Learning Outcomes in the Volleyball Bottom Passing Learning Process Through the Use of the Demonstration Method in Class VIII-9 UPT SPF SMP Negeri 2 Sunggal Academic Year 2022/2023”. Indonesian Journal of Educational Science and Technology, vol. 2, no. 4, Nov. 2023, pp. 355-78, doi:10.55927/nurture.v2i4.6760.