TY  - BOOK
AU  - Leffingwell, Dean
AU  - Widrig, Don
TI  - Managing Software Requirements: use case approach
SN  - 8129703912
U1  - 005.1068 LEF 
PY  - 2003///
CY  - New Delhi
PB  - Pearson Education Asia
KW  - Software engineering management
ER  -