Yenny, Yenny, Elly Herwana, and Raditya Wratsangka. “Mandatory Universal Use of Cloth Mask for Prevention of Coronavirus Disease 2019 Transmission”. Universa Medicina 40, no. 1 (January 19, 2021): 57–68. Accessed April 27, 2024. https://univmed.org/ejurnal/index.php/medicina/article/view/1054.