Sharifah Meryam Shareh Musa, Haryati Shafii, Seow Ta Wee. ISU-ISU ALAM SEKITAR DAN KELESTARIAN. Penerbit UTHM; 2012. Accessed May 6, 2024. https://publisher.uthm.edu.my/omp/index.php/penerbituthm/catalog/book/90