“Environmental Factors and Use of Protective Personal Equipment for the Prevention of Covid-19 in 3 Large Cities in Indonesia (Jakarta, Surabaya and Makassar)”. Medico Legal Update 20, no. 3 (July 24, 2020): 876–881. Accessed May 19, 2026. https://www.ijop.net/index.php/mlu/article/view/1511.