Umlas, Judith Grateful leadership : using the power of acknowledgement to engage all your people and achieve superior results / Judith W. Umlas. - New York : McGraw Hill, 2013. - xii, 239 pages ; 24 cm. Includes index Includes bibliographical references ISBN: 9780071799522 Subjects--Topical Terms: LeadershipEmployee motivation Dewey Class. No.: 658.4092 UML 2013