1. A. H. Al-Dubaisi, Change orders in construction projects in Saudi Arabia, M. Sc. Thesis, College of Graduate Studies, King Fahd University of Petroleum and Minerals, Saudi Arabia, 2000. .
2. S. Aljishi, H. Almarzouq, Change orders in construction projects in Saudi Arabia, Term paper of Construction Engineering and Management Department, King Fahd University of Petroleum and Minerals, Saudi Arabia, 2008. .
3. Causes and effects of change orders on construction projects in Kuwait;Alaryan;Engineering Research and Applications.,2014
4. M. Anees, E. Mohamed, E. Razek. Evaluation of change management efficiency of construction contractors, Housing and Building National Research Center Journal, (2013) 77-85.
5. R. O. Asamaoh, K. Offei-Nyako, Variation determinants in building construction: Ghanaian professionals perspective. Construction Engineering and Project Management (2013) 20-25.