Kumar, K., V. Singh, D. kumar, A. B. Asthana, and D. Mishra. “Effect of Yoga and Meditation on Serum Cortisol Level in First-Year Medical Students”. International Journal of Research in Medical Sciences, vol. 6, no. 5, Apr. 2018, pp. 1699-03, doi:10.18203/2320-6012.ijrms20181762.