TY - BOOK AU - Porter,Michael E. TI - Competitive advantage: creating and sustaining superior performance SN - 9780743260879 (pbk.) AV - HD 41 .P668 2004 U1 - MnSF 658 PY - 2004/// CY - New York, Toronto PB - Free Press KW - Competition KW - Industrial management N1 - Includes bibliographical references (p. 537-540) and index ER -