TY  - BOOK
AU  - Wigander, K..
TI  - Structured Analysis and Design of Information Systems / 
SN  - 0-07-Y66620-2
U1  - Bv:4:g 
PY  - 1978///
CY  - New York : 
PB  - McGraw-Hill Book Company , 
KW  - System Design
ER  -