TY  - BOOK
AU  - Erich Gamma
AU  - Richard Helm
AU  - Ralph Johnson
AU  -  John Vlissides
TI  - Design Patterns: Elements of Reusable Object-Oriented Software
SN  - 9789332555402
U1  - 004.415 GAM - D 
PY  - 2016///
CY  - New Delhi
PB  - PEARSON
KW  - computer
ER  -