TY  - BOOK
AU  - Gamma, Erich 
AU  - Helm, Richard 
TI  - Design Patterns : : elements of reusable object-oriented software
SN  - 978-81-78081-35-9
U1  - 005.12 
PY  - 2004///
CY  - New Delhi
PB  - Pearson Education
N1  - Index
ER  -