TY  - BOOK
AU  - Black, Uyless D.
TI  - Data communications and distributed networks.- 3rd ed
SN  - 9788120309258
U1  - 004.7 BLA 
PY  - 2009///
CY  - New Delhi
PB  - PHI
KW  - Data communications
KW  - Distributed networks
ER  -