TY  - BOOK
AU  - Bellamy J. C.,
TI  - Digital Telephony 3rd ed
SN  - 9788126509294
U1  - 621.385 
PY  - 2014///
CY  - New Delhi
PB  - Wiley India Pvt. Ltd.
KW  - Telecommunication & Switching Systems
ER  -