TY  - BOOK
AU  - Ratzan,Lee
TI  - Understanding information systems : what they do and why we need them / 
SN  - 818408238X
U1  - 025 
PY  - 2009///
CY  - Kolkata : 
PB  - Indiana Publishing House , 
KW  - LIBRARY OPERATION
N1  - Includes index and bibliography
ER  -