Mohd Din, Shamzani Affendy, Rashidi Othman, and Nik Nurul Hidayah Nik Yahya. “METALS IN RESPIRABLE AND INHALABLE DUST AT EDUCATIONAL INSTITUTIONS”. PLANNING MALAYSIA 16, no. 6 (September 12, 2018). Accessed May 18, 2024. https://planningmalaysia.org/index.php/pmj/article/view/457.