5Susan M. Allen and Pamela S. Webster, When Wives Get Sick: Gender Role Attitudes, Marital Happiness, and Husbands ' Contribution to Household Labor, Gender and Society, Vol. 15, 2001.
6Thomas Bailey and Waldinger Roger, Primary, Secondary, and Enclave Labor Markets: A Training Systems Approach, American Sociological Review, Vol. 56,1991.
7G. Becker, Human Capital, New York: National Bureau of Economic Research, 1964.
8G. Becker, A Treatise on the Family ( Enlargeded ), Cambridge, MA : Harvard University Press, 1991.
9David N. F. Bell and Robert A. Hart, Wages, Hours, and Overtime Premia: Evidence from the British Labor Market, Industrial and Labor Relations Review, Vol. 56,2003.
10Ronald Burr, Structural Holes: The Social Structure of Competition, Harvard University Press, 1992.
