8Baldwin L. M. and W. G. Johnson, 1996,"The Employment Effects of Wage Discrimination against Black Men," Industrial and Labor Relation Review,49 ( 2 ) : 302 -316.
9Becket, G. S., 1957, The Economics of Discrimination, Published by University of Chicago Press.
10Carneiro, P., J. J. Heckman and V. M. Dimitriy.2005," Labor Market Discrimination and Racial Differences in Premarket Factors," Journal of Law and Economics,48( 1 ) :1-39.