Daud, Zawawi, Baharin Ahmad, Halizah Awang, Mahmoud Hijab Abubakar, Nazlizan Nasir, and Husnul Azan Tajarudin. “Ammoniacal Nitrogen Removal Using Flamboyant Pods ( Delonix Regia) Adsorbent for Natural Rubber Wastewater Treatment”. International Journal of Integrated Engineering 10, no. 9 (January 1, 2019). Accessed May 29, 2020. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/3651.