Ibrahim, Norisham, and Hanna Athirah Muhammad Rashidi. “Interlocking Bricks: Density and Compressive Strength Reduction Due to Addition of Kaolin Clay and RHA”. International Journal of Integrated Engineering, vol. 15, no. 2, July 2023, pp. 61-69, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/13510.