Cooper, D. (2006). BUSINESS RESEARCH METHODS (9th.). McGraw Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCooper, Donald. BUSINESS RESEARCH METHODS. 9th. New Delhi: McGraw Hill, 2006.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCooper, Donald. BUSINESS RESEARCH METHODS. 9th. McGraw Hill, 2006.
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