1. Barfield, T. 1993. The Nomadic Alternative. Englewood Cliffs.
2. Carneiro, R. 1982. The Chiefdom as Precursor of the State, Jones, G. and Krautz, R. (eds.) The Transition to Statehood in the New World, Cambridge: 37-79.
3. Claessen, H.J.M. and P. Skalnik 1978. The Early State. The Hague.
4. Crumley, C.L. 1995. Heterarchy and the Analysis of Complex Societies, Archaeological Papers of the American Anthropological Association, January: 1-6.
5. Di Cosmo, N. 2002. Ancient China and Its Enemies: The Rise of Nomadic Powers in East Asian History.