, M. Al, M., and A. P. “Coagulation and Flocculation of Bukit Tagar Sanitary Landfill Leachate Using Alum and PAC”. Malaysian Journal of Science, vol. 27, no. 2, Aug. 2008, pp. 39-51, https://samudera.um.edu.my/index.php/MJS/article/view/9206.