Maxwell, John C. The 5 levels of leadership: proven steps to maximize your potential/ John C. Maxwell. - New York: Hachette Book Group, c2011. - 286 p.; 21 cm. Includes bibliographical references ISBN: 978-1-59995-363-2 Subjects--Topical Terms: Leadership. Dewey Class. No.: GC 658.4092 M465 2011