TY  - GEN
AU  - Singh, R. P.
AU  - Sapre, S. D.
TI  - Communication systems: analog and digital 
SN  - 9780070634541
U1  - 621.382 
PY  - 2007///
CY  - New Delhi
PB  - Tata McGraw-Hill Publishing
KW  - Communication tools
N1  - Includes bibliographical references and index
ER  -