Mohd Din, Shamzani Affendy, Rashidi Othman, and Nik Nurul Hidayah Nik Yahya. 2018. “METALS IN RESPIRABLE AND INHALABLE DUST AT EDUCATIONAL INSTITUTIONS”. PLANNING MALAYSIA 16 (6). https://journals.iium.edu.my/pmr/index.php/pmj/article/view/457.