Saepudin, A., and E. Margo. “Relationship Between Knowledge of Acute Respiratory Tract Infection and Use of Face Masks in Motorcyle Online Drivers”. JKKI : Jurnal Kedokteran Dan Kesehatan Indonesia, vol. 12, no. 1, Apr. 2021, pp. 5-10, doi:10.20885/JKKI.Vol12.Iss1.art3.