6Reed, R., & Defillippi, R., Causal Ambiguity, Barriers to Imitation, and Sustainable Competitive Advantage, Academy of Management Review, 15(1), 88- 102,1990.
7Alchian, A & Woodward, S, The Firm is Dead, Long Live the Firm: A Review of Oliver E. Williamson' s the Economic Institutions of Capitalism, Journal of Economic Literature, XXIV,1988, 65 - 79.
8Barney, J. B., & Wright, P. M., On Becoming a Strategic Partner: The Role of Human Resources in Gaining Competitive Advantage, Human Resource Management, Vol.37, No. 1, 31- 46, 1998.
9Schuhz, T.W., Reflections on Investment in Man, Journal of Political Economy 70, October 1962, supplement.
10Barney, J, Firm Resources and Sustained Competitive Advantage, Journal of Management, 17(1), 99 - 120, 1991.