Chaudhary, Shailendra Singh, Manisha Madhukar Nagargoje, Himalaya Singh, Kunver Viresh Singh, Rinu Kumar, and Waqaar Sayeed. 2021. “Variations in Administration of Covid-19 Vaccine During Last 20 Weeks at a Vaccination Center of Agra, Uttar Pradesh”. Indian Journal of Community Health 33 (2):337-43. https://doi.org/10.47203/IJCH.2021.v33i02.020.