5Edward L. Glaeser and Albert Saiz(2003),The Rise of the Skilled City. NBER Working Paper 10191.
6Luisito Bertinelli and Duncan Black(2004), Urbanization and Growth. Journal of Urban Economics. vol. 56. Issue 1. pp. 80-96.
7Topel, Robert (1999), Labor Markets and Economic Growth. In Handbook of Labor Economics, Ed. Orley Ashenfelter and David Card. Amsterdam: North Holland.
8Robert J. Barro,Gary S. Becker and Nigel Tomes(1986), Human Capital and the Rise and Fall of Families. Journal of Labor Economics, Vol. 4, No. 3.
9Becker,Gary S. and R. Barro (1988), A Reformulation of the Economic Theory of Fertility. Quarterly Journal of Economics, Vol. CIII. No. 1.
10Becker, Gary S. K. , M. Murphy, and R. Tamura (1990), Human Capital, Fertility, and Economic Growth. Journal of Political Economy. Vol. 98 No. 5.