A CASE STUDY ON RANHILL WATER SERVICES AND SYARIKAT AIR NEGERI SEMBILAN IN COMBATING THE NON-REVENUE WATER PROBLEM IN JOHOR AND NEGERI SEMBILAN. jgd. 2021;17(1). Accessed November 10, 2025. https://www.educationmalaysia.co.uk/index.php/jgd/article/view/17331