Clifton, Jim It's the manager : Gallup finds the quality of managers and team leaders is the single biggest factor in your organization's long-term success / Jim Clifton ; Jim Harter. - New York, NY : Gallup Press, 2019. - 433 p. : ill. ; 24 cm. Includes bibliographical references. Subjects--Topical Terms: Executive ability.Executives.Leadership.Management. LC Class. No.: HD38.2 / .C565 2019