1O.E. Williamson(1975), Markets and Hierarchies: Anti- Trust Implications. The Free Press.
2G. B. Richardson(1972), "The organization of industry, Economic Journal 82:883 - 896.
3B.Klein, R. Grawford & A. Alchian(1978), "Vertical integration, appropriable rents, and the competitive contracting process", Journal of Law & Economics, 21:297- 326.
4M. E. Porter(1998), "Clusters and new economies of competition", Harvard Business Review 11.
5J. Pfeffer & G. R.Salancik(1978), The External Control d Organizations:A Resource Dependence Perspective, Harper & Row.