Santosa, Agus. “Vitamin D Supplementation for COVID-19: Is It Necessary?”. MEDISAINS: Jurnal Ilmiah Ilmu-Ilmu Kesehatan 18, no. 3 (December 30, 2020): 84–85. Accessed June 18, 2025. http://jurnalnasional.ump.ac.id/index.php/medisains/article/view/9332.