TY  - BOOK
AU  - Gamma, Erich
AU  - Helm, Richard
AU  - Johnson, Ralph
AU  - Vlissides, John
TI  - Design Patterns: Elements of Reusable Object Oriented softwere
SN  - 9788131700075
PY  - 2013///
CY  - N Delhi
PB  - Pearson Edn. Pvt. Ltd.
ER  -