TY  - BOOK
AU  - Gamma E.
AU  - Gamma E.; Helm R.; Johnson R. & Vlissides J.
TI  - Design Patterns: Elements Of Reusable Object-Oriented Software
SN  - 9788131700075
U1  - 004.65 
PY  - 2016///
PB  - Pearson 
ER  -