APA aipamena

Gardner, J. W. (1993). On leadership: With a preface to the paperback edition. Free Press.

Chicago Style aipamena

Gardner, John W. On Leadership: With a Preface to the Paperback Edition. New York: Free Press, 1993.

MLA aipamena

Gardner, John W. On Leadership: With a Preface to the Paperback Edition. Free Press, 1993.