TY  - BOOK
AU  - Fred halsall
AU  - ,
TI  - Data communications, computer networks and open systems
SN  - 8178080982
U1  - 004. 6 HAD 
PY  - 2005///
CY  - NULL
PB  - Pearson Education
KW  - Computer Networks
N1  - Netw-CSE
ER  -