Yee, Ha Chin, Radzi Ismail, and Khoo Terh Jing. “The Barriers of Implementing Green Building in Penang Construction Industry”. Progress in Energy and Environment 12 (February 15, 2020): 1–10. Accessed August 9, 2025. https://akademiabaru.com/submit/index.php/progee/article/view/1060.