TY  - BOOK
AU  - Black, Uyless, D 
TI  - Data communications and distributed networks 
SN  - 81-203-0925-1 
U1  - 005.71 BLA  
PY  - 1993///
CY  - Prentice hall of india 
PB  - New Delhi 
KW  - DATA COMMUNICATION
ER  -