Yaacub, Umira, and Hartini Kasmin. “Groundwater Quality Assessment for Drinking Purposes Using Multivariate Analysis and Surfer in Seremban, Negeri Sembilan”. Journal of Advancement in Environmental Solution and Resource Recovery 2, no. 2 (December 28, 2022): 75–83. Accessed May 5, 2024. https://publisher.uthm.edu.my/ojs/index.php/jaesrr/article/view/12410.