TY  - BOOK
AU  - Wirfs-Brock, Rebecca, Wilkerson,  Brian  & Wiener, Lauren
TI  - Designing object - oriented software
SN  - 81-203-1050-0
U1  - 001.642 Wir 
PY  - 1997///
CY  - Prentice-Hall, New Delhi
ER  -