TY  - BOOK
AU  - Gamma Erich
AU  - Helm Richard 
AU  - Johnson Ralph 
AU  - Vlissides, John
TI  - Design Patterns Elements of Reusable Object Oriented Software
SN  - 9788131700075
U1  - 005.12 
PY  - 2006///
CY  - New Delhi
PB  - Pearson
ER  -