TY  - BOOK
AU  - Herbert, Taub Schilling,Donald,L, Saha, Goutam 
TI  - Principles of communication systems 
SN  - 978-0-07-064811-1 
U1  - 621.382 SCH  
PY  - 2008///
CY  - Tata Mc-Graw hill 
PB  - New Delhi 
KW  - COMMUNICATION SYSTEM
ER  -