Raja Hussin, R. H., W. S. . Wan Sulaiman, A. . Roslan, N. F. M. . Mokhtar, N. A. . Abdul Manaf, N. R. . Ahmad Sa’aduddin, N. N. B. . Wan Abdullah, and N. S. Abdullah. “The Challenges of Mask Wearing Among USIM Medical Students During the Pandemic of COVID-19”. Ulum Islamiyyah, vol. 33, no. 2, Apr. 2021, pp. 131-9, doi:10.33102/uij.vol33no1.287.