Mohd Azwan Abdullah ANF, A. MAJID M, KAMARUDDIN K, Wajil R, Nur Khairunnisa Abdullah. Enhancement of Cement Sand Brick Incorporating Spent Catalyst and Copper Slag as Sustainable Partial Sand Replacements. IJIE. 2025;17(3):251-265. Accessed April 7, 2026. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/20694