TY  - BOOK
AU  - Porter, Michael E.
TI  - Competitive advantage: creating and sustaining superior performance 
SN  - 0743260872
AV  - HD41 .P668 1998.
PY  - 2004///
CY  - New York
PB  - Free Press
KW  - Competition
KW  - Industrial management
N1  - Includes bibliographical references and index
ER  -