Al-Gheethi, Adel. “Establish In-House: A Pre-Treatment Method of Fat, Oil and Grease (FOG) in Kitchen Wastewater for Safe Disposal”. International Journal of Integrated Engineering 11, no. 2 (May 6, 2019). Accessed September 22, 2020. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/4262.