Sudibjo, Prijo, Sumaryanto Sumaryanto, Guntur Guntur, Endang Rini Sukamti, Erwin Setyo Kriswanto, and Soni Nopembri. “Sports While Sunbathing to Increase Immunity During the Covid-19 Pandemic”. International Journal Humanitarian Responsibilities, Education & Sport Sciences (IJHRESS) 2, no. 1 (October 28, 2021): 1–8. Accessed May 12, 2025. https://journal.uny.ac.id/index.php/ijhress/article/view/38911.