TY  - BOOK
AU  - Optner,Stanford L.
TI  - Systems analysis: selected readings 
T2  - Penguin modern management readings
U1  - 658.4034 21
PY  - 1973///].
CY  - [Harmondsworth]: 
PB  - Penguin, 
KW  - System analysis
KW  - Systems engineering
N1  - Includes bibliography and index
ER  -