Ashenfelter, Orley, and David Card. Handbook of Labor Economics. Elsevier, 2011.
“Board of Governors of the Federal Reserve System.” The Fed - Monetary Policy, www.federalreserve.gov/monetarypolicy.htm.
“Center of Workforce Innovations.” Center of Workforce Innovations Technology Both Complements and Substitutes for Labor Comments, www.innovativeworkforce.com/technology-both-complements-and-substitutes-for-labor/.
“Resource-Based View of the Firm.” Encyclopedia of Management Theory, doi:10.4135/9781452276090.n232.
Portes, Alejandro, and Robert King Merton. The Economic Sociology of Immigration: Essays on Networks, Ethnicity, and Entrepreneurship. Russell Sage Foundation, 1998.
Zahniser, Steven. “The Potential Impact of Changes in Immigration Policy on U.S. Agriculture and the Market for Hired Farm Labor.” USDA , www.ers.usda.gov/webdocs/publications/44981/20514_err135_1_.pdf?v=41219.