82Dadson, Nick. "The Real Immigrant-Native Wage Inequality."Metropolis British Columbia Centre of Excellence for Research on Immigration and Diversity No , no. 12-16 (2012).
118Glaeser, Edward L, Albert Saiz, Gary Burtless, and William C Strange. "The rise of the skilled city."(2004) Brookings-Wharton Papers on Urban Affairs.
196McGrattan, Ellen R, and Richard Rogerson. "Changes in hours worked, 1950-2000."Federal Reserve Bank of Minneapolis Quarterly Review 28, no. 1 (2004): 14-33.