Porter, Michael E. 1947- Competitive strategy : techniques for analyzing industries and competitors / [Books]. Michael E. Porter. - New York : The Free Press., 1980. - xx, 396p. : ill. ; 24cm. Includes bibliographical references and indexes. ISBN: 9780029253601 0.00 LCCN: 80065200 Subjects--Topical Terms: Competition. Industrial management. Dewey Class. No.: HD/41 / POR