Bittel, Lester R. The nine master keys of management [by] Lester R. Bittel. - New York, McGraw-Hill [1972] - viii, 303 p. illus. 22 cm. ISBN: 0070054762 LCCN: 72002447 Subjects--Topical Terms: Industrial management. LC Class. No.: HD31 / .B513 Dewey Class. No.: 658.4