Asri, I., & Abd Rahman, R. (2026). Energy Audit and Energy Efficiency Improvement Proposal for Pejabat Pembangunan dan Penyenggaraan (PPP), UTHM. Research Progress in Mechanical and Manufacturing Engineering, 7(1), 171-179. https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/22168