SYED MOHAMAD, SYED BURHANUDDIN HILMI, et al. “Factors Influencing the Cost for Effective Heritage Building Maintenance Programme: Case Study in Ipoh, Perak”. Recent Trends in Civil Engineering and Built Environment, vol. 1, no. 1, Dec. 2020, pp. 95-103, https://publisher.uthm.edu.my/periodicals/index.php/rtcebe/article/view/141.