GILL, R. T. (1973). Economic Development Past And Present Richard T. Gill. Prentice-Hall.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGILL, Richard T. Economic Development Past And Present Richard T. Gill. Prentice-Hall, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGILL, Richard T. Economic Development Past And Present Richard T. Gill. Prentice-Hall, 1973.
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