Othman, M. F. ., A. G. . Zulkifli Zainuddin, S. . Shukri, and R. . Islam. “Company Structure and Level of Service of Syarikat Air Darul Aman (SADA) To Consumers in Kedah”. International Journal of Membrane Science and Technology, vol. 10, no. 2, June 2023, pp. 229-34, doi:10.15379/ijmst.v10i2.1191.