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 August 7, 2026. https://journal.uthm.edu.my/index.php/ijie/article/view/773.