Osman, Baderin, Abdul Mutalib Bin Leman, K.A Rahman, Nik Normunira Mat Hasan, Ng Goot Seong, M.Syafiq Muzarpar, Salwa Mohamad, and Halah Mohamad. “Respiratory Protective Equipment (RPE) Standard – Disposable Filtering Half Mask on N95, FFP2 and KN95”. Journal of Advanced Industrial Technology and Application 3, no. 1 (June 12, 2022): 50–54. Accessed July 18, 2024. https://publisher.uthm.edu.my/ojs/index.php/jaita/article/view/11366.