TY  - GEN
AU  - Leffingwell Dean
AU  - Widrig Don
ED  - 
TI  - Managing Software Requirements: Use Case Approach
SN  - 9788131711798
U1  - 005.106 
PY  - 2013///
CY  - New Delhi
PB  - Pearson
KW  - Computer Science
ER  -