-Algaze Guillermo, 2008. Ancient Mesopotamia at the Dawn of Civilization The Evolution of an Urban landscape, the University of Chicago Press.
-Post gate, J.N. (ed.), 2002. Artifacts of Complexity, Tracking the Uruk in the Near East. London: British School of Archaeology in Iraq.
-Rothman, M.S. (ed.), 2001. Uruk Mesopotamia and Its Neighbors,Cross-Cultural Interactions in the Era of State Formation. Santafe (NM): School of American Research.
-Stein, G., 1999. Rethinking World-Systems; Diasporas, Colonies and Interaction in Uruk Mesopotamia. Tucson (AZ): University of Arizona Press.
- United Nations, World Urbanization Prospects: The 2011 Revision Available on: http://esa.un.org/unup/unup/index_panel1.html.
- Ur, J. A., 2010. Urbanism and Cultural Landscapes in Northeastern Syria: The Tell Hamoukar Survey, 1999-2001. Oriental Institute Publications 137. Chicago: The Oriental Institute of the University of Chicago.