Gardner, J. W. (1993). On leadership: With a preface to the paperback edition. Free Press.
Citazione stile Chigago Style (17a edizione)Gardner, John W. On Leadership: With a Preface to the Paperback Edition. New York: Free Press, 1993.
Citatione MLA (8a ed.)Gardner, John W. On Leadership: With a Preface to the Paperback Edition. Free Press, 1993.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.