TY  - BOOK
AU  - Roddy, Dennis
AU  - Coolen, John 
TI  - Electronic communication 
SN  - 81-203-0984-7
U1  - 621.382 
PY  - 1999///
CY  - New Delhi
PB  - Prentice Hall
KW  - Electronic communications
N1  - Includes index
ER  -