Maxwell, John C., 1947- The 21 most powerful minutes in a leader's day : revitalize your spirit and empower your leadership Twenty one most powerful minutes in a leader's day. John C. Maxwell. - Nashville, Tenn. : Thomas Nelson Publishers, c2000. - xii, 369 p. ; 24 cm. Includes bibliographical references. ISBN: 0785274324 LCCN: 00134098 Subjects--Topical Terms: Leadership.