Abdul Latiff, Ab. Aziz, et al. “Phytoremediation of Metals in Industrial Sludge by Cyperus Kyllingia-Rasiga, Asystassia Intrusa and Scindapsus Pictus Var Argyaeus Plant Species”. International Journal of Integrated Engineering, vol. 4, no. 2, Oct. 2012, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/521.