University of Oklahoma. Bureau of Business Research. Economic development series. University of Oklahoma, Bureau of Business Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUniversity of Oklahoma. Bureau of Business Research. Economic Development Series. Norman: University of Oklahoma, Bureau of Business Research.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUniversity of Oklahoma. Bureau of Business Research. Economic Development Series. University of Oklahoma, Bureau of Business Research.
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