TY  - BOOK
AU  - Roddy,Dennis  .
AU  - Coolen,John   .
TI  - Electronic communications / 
SN  - 9788129701060
U1  - 621.38 
PY  - 2004///
CY  - Delhi : 
PB  - Pearson education , 
KW  - ELECTRONICS
N1  - Includes index
ER  -