Ridzuan, Mohd Bharudin, Zawawi Daud, Ab. Aziz Abdul Latiff, Zulkifli Ahmad, and Zulfairul Zakariah. “Landfill Leachate Treatment Using Hybrid Up-Flow Anaerobic Sludge Blanket (HUASB) Reactor”. International Journal of Integrated Engineering 5, no. 1 (November 19, 2013). Accessed May 2, 2024. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/773.