Shafiq, Nasir, Muhd Fadhil Nuruddin, and Salmia Beddu. “Properties of Concrete Containing Used Engine Oil”. International Journal of Sustainable Construction Engineering and Technology 2, no. 1 (July 13, 2011). Accessed April 28, 2024. https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/60.