TY - BOOK AU - Porter,Michael E. TI - Competitive advantage: creating and sustaining superior performance SN - 0743260872 (paperback) U1 - 658 PY - 2004/// CY - New York, London PB - Free Press KW - Industrial management KW - Competition N1 - Originally published: New York : Free Press ; London : Collier Macmillan, ©1985; Includes bibliographical references (pages 537-540) and index ER -