Abdalamir Abd Kahdum, Karrar Abdulelah Azeez, Mohammed Saleh Mahdi. “The Measuring Productive Efficiency for Analyzing the Sales Activity in Hospitality Sector: AL Mansour Melia Hotel"”. PalArch’s Journal of Archaeology of Egypt Egyptology, vol. 17, no. 6, Sept. 2020, pp. 15288-96, https://archives.palarch.nl/index.php/jae/article/view/6201.