APA (7th ed.) Citation

Hatton, T. J., & Williamson, J. G. (2005). A dual policy paradox: Why have trade and immigration policies always differed in labor-scarce economies? National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Hatton, Timothy J., and Jeffrey G. Williamson. A Dual Policy Paradox: Why Have Trade and Immigration Policies Always Differed in Labor-scarce Economies? Cambridge, Mass: National Bureau of Economic Research, 2005.

MLA (9th ed.) Citation

Hatton, Timothy J., and Jeffrey G. Williamson. A Dual Policy Paradox: Why Have Trade and Immigration Policies Always Differed in Labor-scarce Economies? National Bureau of Economic Research, 2005.