TY  - BOOK
AU  - "Whitten, J. L"
AU  - "Bentley, L. D."
TI  - Systems analysis and design methods
SN  - 0-07-121521-2
U1  - 5.1 
PY  - 2004///
CY  - Boston
PB  - "Mcgraw hill,"
KW  - systems analysis
ER  -