Ettinger, K. E. (1945). International handbook of management. Public Relations Directory and Yearbook, Inc.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEttinger, Karl E. International Handbook of Management. New York, N.Y: Public Relations Directory and Yearbook, Inc, 1945.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEttinger, Karl E. International Handbook of Management. Public Relations Directory and Yearbook, Inc, 1945.
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