Suharti , Suharti, and Harwanto Harwanto. “Improving The Physical Fitness Of Class Viii Students Through Volleyball At Students Of SMP Negeri 36 Surabaya”. Education Journal : Journal Educational Research and Development 7, no. 2 (January 9, 2024): 231–238. Accessed August 3, 2025. https://jurnal.unipar.ac.id/index.php/ej/article/view/1284.