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"Substitution between Immigrants, Natives, and Skill Groups" (with Jeffrey Grogger and Gordon H. Hanson), September 2011.

"The Analytics of the Wage Effect of Immigration," October 2009.

"Recent Trends in the Earnings of Immigrants to the United States" (with Rachel Friedberg), October 2009.

"Imperfect Substitution between Immigrants and Natives: A Reappraisal" (with Jeffrey Grogger and Gordon H. Hanson), NBER Working Paper No. 13887, March 2008. Programs.