Mishra, A., E. T. Tuladhar, V. K. Sharma, M. Raut, A. Bhattarai, M. K. Tamang, and B. K. Yadav. “Does Vitamin D Has Preventive or Treatment Potential to Covid-19 Illness?: A Brief Review”. Journal of Nobel Medical College, vol. 10, no. 1, June 2021, pp. 67-74, doi:10.3126/jonmc.v10i1.38114.