Yacob, Ridzuan, Masran Saruwono, and Zulhabri Ismail. “Managing Uncertainty from Planning and Design to Construction Process of Building Refurbishment Projects: A Proposed Conceptual Approach”. International Journal of Sustainable Construction Engineering and Technology 10, no. 1 (August 25, 2019). Accessed June 14, 2021. https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/4326.