Cita APA (7a ed.)

Hanson, G. H., Robertson, R., & Spilimbergo, A. (1999). Does border enforcement protect U.S. workers from illegal immigration? National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Hanson, Gordon H., Raymond Robertson, y Antonio Spilimbergo. Does Border Enforcement Protect U.S. Workers from Illegal Immigration? Cambridge, MA: National Bureau of Economic Research, 1999.

Cita MLA (9a ed.)

Hanson, Gordon H., et al. Does Border Enforcement Protect U.S. Workers from Illegal Immigration? National Bureau of Economic Research, 1999.