“Combined Multivariate Statistical Techniques and Water Quality Index (WQI) to Evaluate Spatial Variation in Water Quality”. Tropical Life Sciences Research 34, no. 3 (September 30, 2023): 129–149. Accessed November 22, 2024. https://ejournal.usm.my/tlsr/article/view/tlsr_vol34-no-3-2023_7.