TY  - BOOK
AU  - Roddy, Dennis 
TI  - Electronic communications
SN  - 8120709847
AV  - TK 5101 .R63 1984 
PY  - 1984///
CY  - New Delhi
PB  - Prentice-Hall of India
KW  -  Telecommunication
N1  - include bibliographies
ER  -