TY  - GEN
AU  - O'BRIEN, J. A. 
AU  - MARAKAS, G. M. 
TI  - Introduction to information systems. 
SN  - 978-0-07-304355-5
U1  - LECT 658.403 O'BR 
PY  - 2007///
CY  - New York, 
PB  - McGraw-Hill, 
ER  -