TY  - BOOK
AU  - Gamma, Erich Helm, Richard Johnson, Ralph etc
TI  - Design patterns : elements of reusable object-oriented software
U1  - 001.6424  GAM;9 
PY  - 1995///
CY  - New Delhi
PB  - Pearson
KW  - patterns,:,reusable,object-oriented,software
ER  -