TY  - BOOK
AU  - Porter Michael E
TI  - Competitive strategy:  Techniques for analyzing industries and competitors   
SN  - 9780743260886
U1  - X:516, M0;N8 
PY  - 1980///
CY  - New York
PB  - Free Press        
KW  - Commerce
N1  - Bibliography: P 383-87
ER  -