Kamarulzaman, N.A., et al. “Properties of Cement Brick Containing Expanded Polystyrene Beads (EPS) And Palm Oil Fuel Ash (POFA)”. Journal of Science and Technology, vol. 10, no. 4, Dec. 2018, https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/3660.