TY  - BOOK
AU  - Leffingwell, Dean
AU  - widring, Don.
TI  - Managing Software Requirments: A Unified Approach 
SN  - 8178082608
U1  - 005.12028 
PY  - 2000///
CY  - New Delhi
PB  - Pearson Education Asia
N1  - This book also having Bibliography and Appendix A,B,C,D,E from 403-465
ER  -