Dr. Kavya Mathur, Dr. Sandeep Saurabh, Dr. Sugandha Arya, Dr. Satish Chandra, Dr. Aditya Rao, Dr. Vibha Vishwanath Bhat, “COVID -19 Vaccines Amidst Emerging Delta Variant: Review”, dcth, vol. 10, no. 1, pp. 1140–1147, Aug. 2021.