Porter, Michael E., 1947- Competitive advantage : creating and sustaining superior performance / Michael E. Porter. - New York : Free Press ; c1985. - xviii, 557 p. : ill. ; 25 cm. Includes index. Bibliography: p. 537-540. ISBN: 9780743260879 (PB) 0743260872 (PB) 9780684841465 (HB) 0684841460 (HB) Subjects--Topical Terms: Competition.Industrial management. LC Class. No.: HD41 / .P668 1985 Dewey Class. No.: 658 / POR