TY  - GEN
AU  - PORTER, M.
TI  - Competitive  Advantage : Creating  and  Sustaining  Superior  Performance  With  a  new Introduction  
SN  - 0-684-84146-0
U1  - TEA  LECT  658  POR 
PY  - 1985///
CY  - New York
PB  - The Free Press
ER  -