Hanson, G. H., Robertson, R., & Spilimbergo, A. (1999). Does border enforcement protct U.S. workers from illegal immigrationn. National Bureau of Economic Research.
Chicago-referens (17:e uppl.)Hanson, Gordon H., Raymond Robertson, och Antonio Spilimbergo. Does Border Enforcement Protct U.S. Workers from Illegal Immigrationn. Cambridge: National Bureau of Economic Research, 1999.
MLA-referens (9:e uppl.)Hanson, Gordon H., et al. Does Border Enforcement Protct U.S. Workers from Illegal Immigrationn. National Bureau of Economic Research, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.