Thoman, R. S., Conkling, E. C., & Yeates, M. (1968). The geography of economic activity. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रThoman, Richard S., Edgar C. Conkling, और Maurice Yeates. The Geography of Economic Activity. New York: McGraw-Hill, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रThoman, Richard S., et al. The Geography of Economic Activity. McGraw-Hill, 1968.
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