TY  - BOOK
AU  - Ratzan,Lee
TI  - Understanding information systems:What they do and why we need them
SN  - 9788184082388
U1  - 025.04 
PY  - 2009///
CY  - New Delhi
PB  - Indiana
KW  - Library and information science
KW  - information systems
KW  - information storage and retreival
ER  -