Lardika RA, Daharis, Juita A, Zainur. Achievement of learning volleyballs: Correlation between mental hygiene and the level of physical fitness. j. Sport Area [Internet]. 2021 Dec. 7 [cited 2024 May 4];6(3):367-76. Available from: https://journal.uir.ac.id/index.php/JSP/article/view/6513