APA (7th ed.) Citation

Hatton, T. J., & Williamson, J. G. (2002). What fundamentals drive world migration? National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Hatton, Timothy J., and Jeffrey G. Williamson. What Fundamentals Drive World Migration? Cambridge, Mass: National Bureau of Economic Research, 2002.

MLA (9th ed.) Citation

Hatton, Timothy J., and Jeffrey G. Williamson. What Fundamentals Drive World Migration? National Bureau of Economic Research, 2002.