TY  - BOOK
AU  - Director Stephen W.
AU  -  Rohrer Ronald A.
TI  - Introduction to systems theory
T2  - McGraw Hill series in Electronics Systems
U1  - X:8:(B2893), L2 
PY  - 1972///
CY  - New York
PB  - McGraw Hill U. S. A.     
KW  - Operational Management
ER  -