TY  - GEN
AU  - Gamma, Erich
AU  - Helm, Richard
AU  - Johnson, Ralph
AU  - Vlissides,  John
TI  - Design patterns: elements of reusable object-oriented software
SN  - 9789332555402
U1  - 005.12 GAM/D 
PY  - 2016///
CY  - Noida
PB  - Pearson 
KW  - Computer software -- Reusability
ER  -