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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रConference on the Role of Growth Centers in Regional Development और Niles M. Hansen. Growth Centers in Regional Economic Development: [papers]. New York: Free Fress, 1972.
एमएलए (9वां संस्करण) प्रशस्ति पत्रConference on the Role of Growth Centers in Regional Development और Niles M. Hansen. Growth Centers in Regional Economic Development: [papers]. Free Fress, 1972.
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