TY  - BOOK
AU  - Helmy,David
AU  - Shields,Maura
AU  - Yeates,Donald
TI  - System analysis and design
SN  - 0273600664
U1  - 004.21 
PY  - 1994///
CY  - London
PB  - Pitman
KW  - System analysis
KW  - System design
ER  -