1. Frühe Siedlungen im arktischen Nordamerika;J.Aigner;Siedlungen der Steinzeit,1989
2. Axtell, R. (2000). Why agents? On the varied motivations for agent computing in the social sciences. The Brookings Institution. Washington, DC: Center on Social and Economic Dynamics Working Paper No. 17.
3. Weak Emergence;M.Bedau;Philosophical Perspectives: Mind, Causation, and World,1997
4. A Macrosociological Theory of Social Structure