Becker, G. S., & Coyle, D. (2011). The challenge of immigration: A radical solution. Institute of Economic Affairs.
Lua i Stíl Chicago (17ú heag.)Becker, Gary S., agus Diane Coyle. The Challenge of Immigration: A Radical Solution. London: Institute of Economic Affairs, 2011.
Lua MLA (9ú heag.)Becker, Gary S., agus Diane Coyle. The Challenge of Immigration: A Radical Solution. Institute of Economic Affairs, 2011.
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