Nur IzieAdiana Abidin, Rozana Zakaria, and Dodo Yakubu Aminu, Sustainable Building Retrofitting and Energy Efficiency. Penerbit UTHM, 2021. Accessed: Aug. 26, 2026. [Online]. Available: https://monograph.uthm.edu.my/index.php/penerbituthm/catalog/book/350