1. Altonji, Joseph G., and David Card, "The Effects of Immigration on the Labor Market Outcomes of Less-Skilled Natives," in John M. Abowd and Richard B. Freeman, eds., Immigration, Trade, and the Labor Market (Chicago: University of Chicago Press, 1991).
2. Angrist, Joshua D., and Alan B. Krueger, "Empirical Strategies in Labor Economics," in Orley C. Ashenfelter and David Card, eds., Handbook of Labor Economics, Vol. 3A (Amsterdam: Elsevier, 1999).
3. Becker, Gary S., Human Capital, 2nd edition (New York: Columbia University Press, 1975).
4. Assimilation, Changes in Cohort Quality, and the Earnings of Immigrants