Mohamed Ishak, Mohamed Suhaini, and Zulhabri Ismail. “Variation Management in Construction Contracts: A Comparative Study of PWD 203A (Rev. 01 2010) and PAM 2018”. Journal of Technology Management and Business, vol. 12, no. 2, Dec. 2025, pp. 33-49, https://penerbit.uthm.edu.my/ojs/index.php/jtmb/article/view/22447.