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”. Drugs and Cell Therapies in Hematology 10, no. 1 (August 5, 2021): 1140–1147. Accessed May 5, 2024. http://dcth.org/index.php/journal/article/view/227.