TY  - BOOK
AU  - Porter, M.
TI  - Competitive advantage : : creating and sustaining superior performance
SN  - 0684841460
AV  - HD 41 .P668 1998 
PY  - 1998///
CY  - New York : 
PB  - Free press
KW  - Competition.
KW  - Industrial management
N1  - includes bibliographical references and index
ER  -