1. White LA (1959) The Evolution of Culture (McGraw Hill, New York), pp 333–338.
2. Childe VG (1953) New Light on the Most Ancient Near East (Praeger, New York), pp 123–147.
3. Price DT Brown JA (1985) in Prehistoric Hunter-Gatherers: The Emergence of Cultural Complexity, eds Price DT Brown JA (Academic, New York), pp 3–20.
4. Clark JD Blake M (1994) in Factional Competition and Political Development in the New World, eds Brumfiel EM Fox J (Cambridge Univ Press, Cambridge, UK), pp 17–30.
5. Hayden B (1996) in Emergent Complexity: The Evolution of Intermediate Societies, ed Arnold J (Intl Monographs in Prehistory, Ann Arbor, MI), pp 50–58.