Alaa H. Jadar, and Hesham Mugharbil. “HOW DOES THE EFFICIENCY IN SERVICE BUSINESS? INFLUENCE SERVICE QUALITY? AN ANALYSIS”. PalArch’s Journal of Archaeology of Egypt Egyptology, vol. 18, no. 15, May 2021, pp. 372-80, https://www.archives.palarch.nl/index.php/jae/article/view/8631.