TY  - BOOK
AU  - Dean Leffingwell
AU  - Don Widrig
TI  - Maging software requirements: a use case approach
SN  - 81-297-0391-2
U1  -  005.1 
PY  - 2003///
CY  - Delhi,India
PB  - Pearson Education
KW  - Software
ER  -