TY  - BOOK
AU  - Porter,Michael E.
TI  - Competitive advantage: creating and sustaining superior performance 
SN  - 0029250900
U1  - 658 POR 
PY  - 1985///
CY  - New York, London
PB  - Free Press, Collier Macmillan
KW  - Competition
KW  - Industrial management
N1  - Includes index
ER  -