Sohu, Samiullah, Abd Halid Abdullah, Sasitharan Nagapan, Ashfaque Ahmed Jhatial, and Muhammed Tahir. “Contributing Cost Variation Factors in Highway Projects”. Civil Engineering Journal 4, no. 8 (August 26, 2018): 1793–1798. Accessed June 24, 2025. https://www.civilejournal.org/index.php/cej/article/view/909.