Kettner, F. (1936). The need for a secretary of peace. Biosophical Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKettner, Frederick. The Need for a Secretary of Peace. New York, N.Y.: Biosophical Institute, 1936.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKettner, Frederick. The Need for a Secretary of Peace. Biosophical Institute, 1936.
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