Hanson, G. H., Robertson, R., & Spilimbergo, A. (1999). Does border enforcement protct U.S. workers from illegal immigrationn. National Bureau of Economic Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHanson, Gordon H., Raymond Robertson, और Antonio Spilimbergo. Does Border Enforcement Protct U.S. Workers from Illegal Immigrationn. Cambridge: National Bureau of Economic Research, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHanson, Gordon H., et al. Does Border Enforcement Protct U.S. Workers from Illegal Immigrationn. National Bureau of Economic Research, 1999.
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