Hussain, Mujahid, Imdad Hussain, Mahnoor ., and Muhammad Gulsher. “Coronavirus; Chemistry of Washing Hands With Soap for 20 Seconds”. Pakistan Journal of Public Health 10, no. 1 (October 26, 2020): 8-10. Accessed April 18, 2021. https://pjph.org/index.php/pjph/article/view/547.