TY  - BOOK
AU  - GAMMA, ERICH
TI  - DESIGN PATTERNS: ELEMENTS OF REUSABLE OBJECT-ORIENTED SOFTWARE 
SN  - 81-7808-135-0
U1  - 005.8 O 03 GAM/HEL 
PY  - 2003///
CY  - NEW DELHI
PB  - PEARSON EDUCATION
ER  -