TY  - BOOK
AU  - Porter,Michael E.
TI  - Competitive advantage: creating and sustaining superior performance 
SN  - 0029250900
PY  - 1985///
CY  - New York
PB  - The Free Press
KW  - Competition
KW  - Industrial management
N1  - Bibliography: p.537-540; Includes index
ER  -