1. r.m:adams, 1966 . The Evolution of Urban Society. Early Mesopotamia and Prehistoric Mexico. (Chicago).
2. r.m.adams, andh.j.nissen, 1972 : The Uruk country side. The Natural Setting of Urban Societies. (Chicago - London).
3. p.bagby, 1958 : Culture and History. Prolegomena to the Comparative Study of Civilizations. (London).
4. p.a.berger, 1983 : Herrschaftsform Stadt. Eine soziologische Rekonstruktion der Stadtgeschichte im Altertum.