M. Zolkipli, H, H Juahir, G Adiana, N Zainuddin, A B. H. M. Maliki, M E. Toriman, M Mokhtar, and R Elfitri. 2018. “Spatial Assessment of Selangor, Malaysia Water Treatment Plant Performance Using Chemometric Technique”. International Journal of Engineering & Technology 7 (3.14): 139-46. https://doi.org/10.14419/ijet.v7i3.14.16874.