Yahya, Ahmad Asyari, Noorwirdawati Ali, Abdul Aziz Abdul Samad, Nur Liyana Mohd Kamal, Shahiron Shahidan, and Siti Radziah Abdullah. “Mortar Containing Coal Bottom Ash (CBA) Treated With Citric Acid As Partial Cement Replacement”. International Journal of Integrated Engineering 16, no. 9 (December 4, 2024): 118–129. Accessed April 7, 2026. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/19564.