Salim, Syufian ‘Afif, and Roshartini Omar. “Amalan Kerja-Kerja Penyelenggaraan Proses Rawatan Air Oleh Pihak Ranhill SAJ ”. Research in Management of Technology and Business, vol. 2, no. 1, June 2021, pp. 1176-90, https://penerbit.uthm.edu.my/periodicals/index.php/rmtb/article/view/2054.