TY  - GEN
AU  - Shay, William A
AU  - Shay, William A
TI  - Understanding data communications & networks
SN  - 9789812400505
U1  - 004.7 SHA 
PY  - 2001///
CY  - New Delhi
PB  - Thomson
KW  - Data communications
KW  - Data networks
ER  -