NOORUL HUDAI ABDULLAH, NORHAYATI NGADIMAN, and NOR BAIZURA HAMID, ENVIRONMENTAL ENGINEERING (LABORATORY) VERSION 2023. Penerbit UTHM, 2025. Accessed: Aug. 26, 2026. [Online]. Available: https://monograph.uthm.edu.my/index.php/penerbituthm/catalog/book/490