TY  - BOOK
AU  - Porter, Michael E.
TI  - Competitive advantage: Creating and sustaining superior performance: Michael E. Porter
SN  - 0029250900
AV  - 8349518 
PY  - 1985///
CY  - New York
PB  - The Free Press
KW  - Competition
N1  - Includes bibliographies and index
ER  -