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 [Internet]. 2021 Jan. 31 [cited 2025 Nov. 10];17(1). Available from: https://www.educationmalaysia.co.uk/index.php/jgd/article/view/17331