1.
Amzafi N, Ishak SA, Abdul Rahim M, et al. A Systematic Review of the Causes and Effects of Variation Orders in the Sustainable Construction Industry in Developing Countries. IJIE. 2024;16(4):188-203. Accessed April 9, 2026. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/16252