Gardner, J. W. (1993). On leadership: With a preface to the paperback edition. Free Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGardner, John W. On Leadership: With a Preface to the Paperback Edition. New York: Free Press, 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGardner, John W. On Leadership: With a Preface to the Paperback Edition. Free Press, 1993.
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