Hatton, T. J., & Williamson, J. G. (2004). International migration in the long-run: Positive selection, negative selection and policy. National Bureau of Economic Research.
Chicago-Zitierstil (17. Ausg.)Hatton, Timothy J., und Jeffrey G. Williamson. International Migration in the Long-run: Positive Selection, Negative Selection and Policy. Cambridge, Mass: National Bureau of Economic Research, 2004.
MLA-Zitierstil (9. Ausg.)Hatton, Timothy J., und Jeffrey G. Williamson. International Migration in the Long-run: Positive Selection, Negative Selection and Policy. National Bureau of Economic Research, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.