Tham Cheong Sheng, Mariah Awang, and Mohammad Ashraf Abdul Rahman. “Preliminary Study of Energy and Cost Saving Potential of Lighting System in Teaching Building”. Politeknik & Kolej Komuniti Journal of Social Sciences and Humanities 2, no. 1 (November 19, 2017): 160–166. Accessed January 14, 2026. https://app.mypolycc.edu.my/journal/PMJSSH/article/view/139.