TY  - BOOK
AU  - Leffingwell , Dean
AU  - Widrig , Don.
TI  - Managing software requirements : a unified approach
SN  - 8178082608 
U1  - 005.1 
PY  - 1994///
CY  - Delhi
PB  - Pearson Education
KW  - Computer programmingprograms data
ER  -