Noorul Hudai Abdullah, Norhayati Ngadiman, Nor Baizura Hamid, Hazirah Bujang, Suhaila Sahat, and Muhammad Azraie Abdul Kadir. Environmental Engineering (Laboratory). Penerbit UTHM, 2023. Accessed March 12, 2026. https://publisher.uthm.edu.my/omp/index.php/penerbituthm/catalog/book/384.