ELKINGTON JOHN. (2008). POWER OF UNREASONABLE PEOPLE. HARVARD BUSINESS SCHOOL PRESS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रELKINGTON JOHN. POWER OF UNREASONABLE PEOPLE. BOSTON: HARVARD BUSINESS SCHOOL PRESS, 2008.
एमएलए (9वां संस्करण) प्रशस्ति पत्रELKINGTON JOHN. POWER OF UNREASONABLE PEOPLE. HARVARD BUSINESS SCHOOL PRESS, 2008.
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