Krissanthy, Aprillia, Febi Kurniawan, and Citra Resita. “Correlation Between Physical Fitness and Student Concentration Level of SMAN 9 Bekasi”. Jurnal Literasi Olahraga 1, no. 1 (July 21, 2021). Accessed October 20, 2025. https://fkipunsika.id/index.php/JLO/article/view/3923.