Sharma, Neeta M, and Aditya Rakesh Chaudhary. “Evolution of Masks As Public Health Intervention in the Control of Respiratory Outbreaks”. National Journal of Community Medicine 11, no. 03 (March 31, 2020): 138–140. Accessed July 22, 2024. https://njcmindia.com/index.php/file/article/view/239.