TY  - BOOK
AU  - Erich Gamma,Richard Helm, Ralph Johnson and John Vlissides
TI  - Design Patterns :Elements of Reusable Object -Oriented Software
SN  - 9788178081359
U1  - GAM 
PY  - 2002///
CY  - Delhi
PB  - Pearson Education
KW  - Computer Science
ER  -