Becker, G. S., & Coyle, D. (2011). The challenge of immigration: A radical solution. Institute of Economic Affairs.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBecker, Gary S., और Diane Coyle. The Challenge of Immigration: A Radical Solution. London: Institute of Economic Affairs, 2011.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBecker, Gary S., और Diane Coyle. The Challenge of Immigration: A Radical Solution. Institute of Economic Affairs, 2011.
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