Donald Cooper. (2019). Business Reserarch Methods (12th ed.). McGraw Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDonald Cooper. Business Reserarch Methods. 12th ed. Delhi: McGraw Hill, 2019.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDonald Cooper. Business Reserarch Methods. 12th ed. McGraw Hill, 2019.
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