(1974). Executive's personal development letter. Alexander Hamilton Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रExecutive's Personal Development Letter. New York: Alexander Hamilton Institute, 1974.
एमएलए (9वां संस्करण) प्रशस्ति पत्रExecutive's Personal Development Letter. Alexander Hamilton Institute, 1974.
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