Ang, Zi Jian, and Dr. Hamidun bin Mohd Noh. 2022. “U-Shaped Concrete Drain Containing Rice Husk Ash As Partial Cement Replacement by Using Non-Autoclaved Aerated Technique”. Research in Management of Technology and Business 3 (1): 387–405. https://penerbit.uthm.edu.my/periodicals/index.php/rmtb/article/view/7068.