8Becker G. S., 1967, "Human Capital and the Personal Distribution of Income", W. S. Woytinsky Lecture, No.l, University of Michigan.
9Blinder, Alan S., 1973, "Wage Discrimination: Reduced Form and Structural Estimates", Journal of Human Resources, 8, pp.436-455.
10Card, David and Alan Krueger, 1992, "Does School Quality Matters? Returns to Education and the Characteristics of Public Schools in the United States", Journal of Political Economy, 100(1), pp.1-40.