A.W, Zularisam, Ismail A.F, and Salim M.R. 2007. “Ultrafiltration of Natural Organic Matter (NOM): Effect of NOM Characteristics on Membrane Rejection Mechanisms in Drinking Water Process”. Malaysian Journal of Science 26 (1):97-107. http://mojes.um.edu.my/index.php/MJS/article/view/7979.