Lardika, Rola Angga, Daharis, Ardiah Juita, and Zainur. “Achievement of Learning Volleyballs: Correlation Between Mental Hygiene and the Level of Physical Fitness”. Journal Sport Area 6, no. 3 (December 7, 2021): 367–376. Accessed June 24, 2024. https://journal.uir.ac.id/index.php/JSP/article/view/6513.