Nurmasitoh, Titis. “Physical Activities, Exercises, and Their Effects to the Immune System”. JKKI : Jurnal Kedokteran dan Kesehatan Indonesia 7, no. 2 (April 18, 2016): 52–58. Accessed May 2, 2024. https://journal.uii.ac.id/JKKI/article/view/4502.