TY  - GEN
AU  - Gamma, Erich.
AU  - Gamma, Erich
AU  - Helm, Richard
TI  - Design patterns:Elements of reusable object - oriented software
SN  - 9 788178 081359
U1  - 004.420 GAM 
PY  - 2002///
CY  - Delhi
PB  - Pearson Education
KW  - Object - oriented programming
ER  -