Teoh WP, Chee SY, Habib NZ, Ng CA. An Attempt to Maximize the Use of Used Cooking Oil and Fly Ash in the Production of Green Roofing Tile. ijscet. 2022;13(1):273-281. Accessed July 23, 2024. https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/11064