1. Bierstedt R. The social order. New York: McGraw Hill, 1970:148–65.
2. Ogburn WF. On culture and social change. Chicago: University of Chicago Press, 1964:86–95.
3. Rosenberg N. Schumpeter and Marx: how common a vision? In: MacLeod R, editor. Technology and the human prospect. London: Pinter, 1986:197–210.
4. Altman I, Chemers M. Culture and environment. Cambridge: Cambridge University Press, 1994:19–24.
5. Genesis 1, verse 28, The Holy Bible, King James Version. New York: American Bible Society.