TY  - BOOK
AU  - Porter, Michael E.
AU  - 
TI  - Competitive advantage: creating and sustaining superior performance
SN  - 0-02-925090-0
U1  - 658 P844 1985 
CY  - New York
PB  - The Free Press.
KW  - Industrial management
KW  - Competition
N1  - Includes index
ER  -