ABD RAZAK, NIK MUHAMAD AFIQ HAKIME, and Ts. SYED BURHANUDDIN HILMI SYED MOHAMAD. “Study on the Deterioration Level of Piping System in Old and Heritage Building in Batu Pahat, Johor”. Recent Trends in Civil Engineering and Built Environment, vol. 3, no. 1, Dec. 2021, pp. 844-52, https://publisher.uthm.edu.my/periodicals/index.php/rtcebe/article/view/3141.