TY  - BOOK
AU  - Carlson, Bruce A.
TI  - Communication system: an introduction to signals and noise in electrical communication 
SN  - 007009957X
AV  - 1936 & 2478 
U1  - 621.382 22
PY  - 1975///
CY  - India
PB  - McGraw-Hill, 
ER  -