Clemens, Michael A. Economics and Emigration: Trillion-Dollar Bills on the Sidewalk?. Journal of Economic Perspectives. 1 August 2011, 25 (3): 83–106. ISSN 0895-3309. doi:10.1257/jep.25.3.83.
Hamilton, B.; Whalley, J. Efficiency and distributional implications of global restrictions on labour mobility: calculations and policy implications. Journal of Development Economics. 1 February 1984, 14 (1–2): 61–75. ISSN 0304-3878. PMID 12266702. doi:10.1016/0304-3878(84)90043-9.
merriam-webster.com
immigrate. Merriam-Webster.com. Merriam-Webster, In. [27 March 2014]. (原始内容存档于2014-03-28).
nih.gov
ncbi.nlm.nih.gov
Hamilton, B.; Whalley, J. Efficiency and distributional implications of global restrictions on labour mobility: calculations and policy implications. Journal of Development Economics. 1 February 1984, 14 (1–2): 61–75. ISSN 0304-3878. PMID 12266702. doi:10.1016/0304-3878(84)90043-9.
oxforddictionaries.com
immigration. OxfordDictionaries.com. Oxford University Press. [11 May 2016]. (原始内容存档于2016-05-18).
Clemens, Michael A. Economics and Emigration: Trillion-Dollar Bills on the Sidewalk?. Journal of Economic Perspectives. 1 August 2011, 25 (3): 83–106. ISSN 0895-3309. doi:10.1257/jep.25.3.83.
Hamilton, B.; Whalley, J. Efficiency and distributional implications of global restrictions on labour mobility: calculations and policy implications. Journal of Development Economics. 1 February 1984, 14 (1–2): 61–75. ISSN 0304-3878. PMID 12266702. doi:10.1016/0304-3878(84)90043-9.