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 August 13, 2026. https://journal.uthm.edu.my/index.php/IJSCET/article/view/60.