V, Narmathadevi, Ramya K, Kishore Balasubramanian, and Das J. “A Precursor on Pandemic Corona Virus: An Infectious Disease: COVID-19”. Asian Journal of Applied Sciences 8, no. 3 (June 28, 2020). Accessed August 11, 2020. https://www.ajouronline.com/index.php/AJAS/article/view/6156.