Abubakar, A. U., & Baharudin, K. S. (2012). Properties of Concrete using Tanjung Bin Power Plant Coal Bottom Ash and Fly Ash. International Journal of Sustainable Construction Engineering and Technology, 3(2), 56-69. https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/518