Dowling, William F. How managers motivate: the imperatives of supervision / [by] William F. Dowling [and] Leonard R. Sayles. - 2nd ed. - New York : McGraw-Hill, c1978. - 436 p. : ill. Includes bibliographies. ISBN: 007017668X LCCN: 92033206 Subjects--Topical Terms: Supervisors.Supervision of employees.