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6Goldin, Claudia, and Lawrence Katz, The Race between Education and Technology, Cambridge: Harvard University Press, 2008.
7Christopher Avery and Sarah Turner, "Student Loans: Do College Students Borrow Too Much-Or Not Enough?" The Journal of Eco- nomic Perspectives, Vol. 26, No. 1, 2012, pp. 165-192.
8Christopher Avery and Sarah Turner, "Student Loans: Do College Students Borrow Too Much-Or Not Enough?" The Journal of Eco- nomic Perspectives, Vol. 26, No. 1 , 2012, pp. 165-192.