TY  - BOOK
AU  - Gamma, Erich
AU  - Helm, Richard
AU  - Johnson, Ralph
TI  - Design Patterns: elements of reusable object oriented software
SN  - 8178081350
U1  - 005.117 GAM 
PY  - 1995///
CY  - Delhi
PB  - Pearson Education
KW  - Software Design
KW  - Program Design
ER  -