Abbas, dr.Anas, and Slaiman Hummadi. “Incentives and Their Effect on Performance (A Field Study)”. TANMIYAT AL-RAFIDAIN 31, no. 93 (March 1, 2009): 105–123. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/tanmiyat/article/view/29597.