TY  - BOOK
AU  - Singh,R.P.
AU  - Sapre, S.D.
TI  - Communication systems: analog and digital 
SN  - 9781259004605
U1  - 621.382 
PY  - 2012///
CY  - New Delhi
PB  - Tata McGraw-Hill
N1  - Includes bibliographical references and index
ER  -