4Alchian, A., 1950 "Uncertainty, Evolution and Economic Theory" , Journal of Political Economy 58(3). 211-221.
5Baumol,William J. 1990, "Entrepreneurship: Productive, Unproductive, and Destructive" , Journal of Political Economy, 98 (5): 893-921.
6Ivan. SzeIenyi, 1988, Socialist Entrepreneurs. Madison. University of Wisconsin Press.James Coleman,Foundation of Social Theory Harvard University Press.
7Kets De Vries, M. F. R. 1977,"The Entrepreneurial Personality: A Person at the Crossroads." Journal of Management Studies, 14, 34-58.
8Leibeinstein, Harvey. 1987, "Entrepreneurship,Entrepreneurial Training and X-efficiency Theovy ",Journal of Economic Behavior and Organization, 8.191-205.
9Lentz,Bemard, F. & Laband, David N.1990, "Entrepreneurial Success and Occupational Inheritancc among Proprietors" , Canadian Journal of Economics,23(3): 563-79.
10McClelland, David. 1961, The achieving society.Princeton:D. Van Nostrand Co.