RIES AL. (2004). ORIGIN OF BRANDS: DISCOVER THE NATURAL LAW. HARPER BUSINESS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRIES AL. ORIGIN OF BRANDS: DISCOVER THE NATURAL LAW. NEW YORK: HARPER BUSINESS, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRIES AL. ORIGIN OF BRANDS: DISCOVER THE NATURAL LAW. HARPER BUSINESS, 2004.
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