Irfan, Mohammad. “The Relationship Between Education Level, Income Figures and Sports Preferences: A Perspective on the Cost of Exercise and Physical Fitness”. Jurnal Pendidikan Jasmani (JPJ) 5, no. 2 (October 31, 2024): 168-178. Accessed April 20, 2025. https://jurnal.stokbinaguna.ac.id/index.php/JPJ/article/view/3106.