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