TY  - BOOK
AU  - Gamma, Erich; Helm, Richard;  Johnson, Ralph & Vlissides, John
TI  - design patterns: Elements of reusable object-oriented software
SN  - 81-7808-135-0
U1  - 001.642 Gam 
PY  - 1995///
CY  - Pearson education pte. ltd., Singapore
ER  -