TY  - GEN
AU  - PORTER,  M . E.
TI  - Competitive Strategy: Techniques  for  Analyzing Industries  and Competitors  with  a new  Introduction
SN  - 0-684-84148-7
U1  - TEA  LECT  658  POR 
PY  - 1980///
CY  - New York
PB  - The Free Press
ER  -