Rustamani, Shabnam. “Comparative Evolution of Animal and Human Coronaviruses, Their Varieties and Virulence”. Journal of Liaquat University of Medical & Health Sciences 20, no. 4 (November 18, 2021): 281–283. Accessed February 9, 2025. http://ojs.lumhs.edu.pk/index.php/jlumhs/article/view/301.