Sakke, N., H. Ithnin, and M. S. Y. Che Ngah. “Pengaruh Air Tidak Berhasil (NRW) Ke Atas Kemapanan Bekalan Air Di Selangor, Malaysia: Influence of Non-Revenue Water (NRW) on the Sustainability of Water Supply in Selangor, Malaysia”. Perspektif Jurnal Sains Sosial Dan Kemanusiaan, vol. 6, no. 2, Nov. 2014, pp. 66-81, https://ojs.upsi.edu.my/index.php/PERS/article/view/1664.