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 June 4, 2025. https://www.planningmalaysia.org/index.php/pmj/article/view/457.