TY  - BOOK
AU  - Gamma Erich
AU  - Helm Richard
TI  - Design Patterns Elements of Reusable Object Oriented Software
SN  - 9789332555402
U1  - 681.3.06.004.8 GAM 
PY  - 2015///
CY  - New Delhi
PB  - Pearson Education
KW  - Design Patterns
ER  -