Astaginy, Niar. " An Analysis of Customer’s Satisfaction Level to the Quality of Services Provided by Regional Water Supply Company (PDAM) of Kolaka Regency." Jurnal Darussalam: Jurnal Pendidikan, Komunikasi dan Pemikiran Hukum Islam [Online], 9.1 (2017): 13-23. Web. 18 Oct. 2018