Al-Jebouri, Maha, Ahmad F. Oran, and Ghazi Al-Assaf. “The Impact of Urban Concentration on Economic Growth: An Empirical Investigation for a Sample of Countries”. International Journal of Economics and Financial Issues 10, no. 4 (July 11, 2020): 116–124. Accessed May 27, 2022. https://www.econjournals.com/index.php/ijefi/article/view/10012.