TY  - BOOK
AU  - Herbert, Taub Schilling,Donald,L 
TI  - Principles of communication systems 
SN  - 0-07-462456-3 
U1  - 621.382 SCH  
PY  - 2007///
CY  - Tata mc graw hill 
PB  - New Delhi 
KW  - COMMUNICATION SYSTEM
ER  -