TY  - BOOK
AU  -  Singh Anokh. 
AU  - Chhabra A K
TI  - Principles of communication engineering
SN  - 81-219-0476-5 
U1  - 621.382 
PY  - 2011///
CY  - New delhi
PB  -  S Chand 
KW  - Engineering
ER  -