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Smith, M. E. (2005). City size in late post-classic Mesoamerica. Journal of Urban History, 31(4),
403–434.
UN (United Nations, Department of Economic and Social Affairs, Population Division). (2018).
World urbanization prospects: The 2018 revision. Online Edition. Retrieved from https://
population.un.org/wup/Download/
Watson, A. M. (1974). The Arab agricultural revolution and its diffusion, 700–1100. The Journal of
Economic History, 34, 8–25.
Wilson, A. (2011). City sizes and urbanization in the Roman Empire. In A. Bowman & A. Wilson
(Eds.), Settlement, urbanization, and population (pp. 161–195). Oxford: Oxford University
Press.
5 Regional Diversity and Sustainability of Megacities in Global Historical. . .
101