TY  - BOOK
AU  - Porter, Michael E.
TI  - Competitive advantage: Creating and sustaining superior performance 
SN  - 9780029250907
U1  - 658 19
PY  - 1985///
CY  - New York
PB  - The Free Press
KW  - Industrial management
N1  - Includes bibliographical references and index
ER  -