6. Bermingham, John. “Immigration: Not a Solution to Problems of Population Decline and Aging.” Springer. Kluwer Academic Publishers-Plenum Publishers
4. Coppel, J., J. Dumont and I. Visco (2001), “Trends in Immigration and Economic Consequences”, OECD Economics Department Working Papers, No. 284, OECD Publishing.
2. Borjas, George. Freeman, Richard. “Immigration and the Work Force: Economic Consequences for the United States.”
1. Card, David. Inman, Robert. “Making Cities Work: Prospects and Policies for Urban America.” PP 156-161. Print. 12 September, 2015.
7. Hoefer, Michael. Rytina, Nancy. Baker, Bryan. “Estimates of the Unauthorized Immigrant Population Residing in the United States: January 2011
3. Hollifield, James. Orrenius, Pia. Martin, Phillip. “Controlling Immigration: A Global Perspective, Third Edition