Hassan, Bassam, Fayez Jrad, and Sonya Ahmad. “Study the Causes of Formal Change Orders and Analyze Their Impact on Building Projects”. Tishreen University Journal -Engineering Sciences Series 35, no. 4 (March 8, 2015). Accessed April 19, 2024. https://journal.tishreen.edu.sy/index.php/engscnc/article/view/321.