Yusoff, Syafinah. “Measurement of Odour on Source of Drinking Water Using Threshold Odour Number and Modified Olfactometry”. International Journal of Integrated Engineering 11, no. 2 (May 6, 2019). Accessed May 3, 2024. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/4248.