NOOR KHAZANAH A RAHMAN, MOHHAR MOHAMED, and KAMARUL AINI MOHD. SARI, Konkrit. Penerbit UTHM, 2025. Accessed: Apr. 09, 2026. [Online]. Available: https://penerbit.uthm.edu.my/omp/index.php/penerbituthm/catalog/book/532