Ahmad, Z., Z. Ujang, G. Olsson, and A.A. Abdul Latiff. 2009. “Evaluation of Hybrid Membrane Bioreactor (MBR) For Palm Oil Mill Effluent (POME) Treatment”. International Journal of Integrated Engineering 1 (2). https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/85.