Sharifah Meryam Shareh Musa, Haryati Shafii, and Seow Ta Wee, ISU-ISU ALAM SEKITAR DAN KELESTARIAN. Penerbit UTHM, 2012. Accessed: Apr. 10, 2026. [Online]. Available: https://penerbit.uthm.edu.my/omp/index.php/penerbituthm/catalog/book/90