داود غسان قاسم, and غناوي حيدر عدنان. “The Impact of Customer Contact on Operation Performance Case Study in the Specialist Dental Centre in Al-Alwia”. Journal of Economics and Administrative Sciences 20, no. 75 (February 1, 2014): 63. Accessed March 13, 2025. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/558.