Hendro Prajitno, Jongky, et al. «The Proper Use of Face Mask During COVID-19 Pandemic in Urban Community». Gaceta Médica De Caracas, vol. 129, n.º 2S, septiembre de 2021, pp. S299-S304, https://saber.ucv.ve/ojs/index.php/rev_gmc/article/view/22912.