1. Bairoch, P. Cities and Economic Development: From the Dawn of History to the Present (Univ. Chicago Press, 1988).
2. Chandler, T. & Fox, G. Three Thousand Years of Urban Growth (Academic Press, 1974).
3. Gottmann, J. Megalopolis: The Urbanized Northeastern Seaboard of the United States (Twentieth Century Fund, 1961).
4. Mumford, L. What is a city? Archit. Rec. 82, 93–96 (1937).
5. Varzi, A. C. What is a city? Topoi 40, 399–408 (2021).