GUELL, R. C. (2005). Issues in economics today. McGraw Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGUELL, Robert C. Issues in Economics Today. McGraw Hill, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGUELL, Robert C. Issues in Economics Today. McGraw Hill, 2005.
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