Kamaruzzaman , Salizawati, and Zahid Daim. “Development of Lightweight Paving Block Using Plastic Bottles and SW-PU200”. Politeknik & Kolej Komuniti Journal of Engineering and Technology 5, no. 1 (November 30, 2022): 99–105. Accessed November 25, 2024. https://app.mypolycc.edu.my/journal/index.php/PMJET/article/view/283.