TY  - BOOK
AU  - Kennedy George. 
AU  - Davis Bernard
TI  - Electronic communication systems
SN  - 13:978-0-07-463682-4 
U1  - 621.381 
PY  - 2011///
CY  - New delhi
PB  -  Tata Mcgraw Hill 
KW  - Engineering
ER  -