Bryantara, Oktian Firman. “Factors That Are Associated to Physical Fitness (VO2 Max) of Football Athletes”. Jurnal Berkala Epidemiologi 4, no. 2 (February 5, 2017): 237–249. Accessed June 9, 2025. https://e-journal.unair.ac.id/JBE/article/view/2149.