TY  - GEN
AU  - Bates,Regis [Bud]
AU  - Gregory,Donald W.
TI  - Voice & data communications handbook
SN  - 0070647666
U1  - 621.382 
PY  - 2007///
CY  - New Delhi
PB  - Tata Mc-Graw Hill Publishing
N1  - Includes  index
ER  -