Beh, Hui Tian, et al. “Sustainable Development of The Historical City: Revitalization of Bukit Mertajam Through Hybrid Architecture Approach”. International Journal of Sustainable Construction Engineering and Technology, vol. 14, no. 2, May 2023, pp. 131-8, https://penerbit.uthm.edu.my/ojs/index.php/IJSCET/article/view/13562.