TY  - BOOK
AU  - Held,Gilbert, x
AU  - -
TI  - Understanding data Communications: -
SN  - 9788131708729
U1  - 004.6/H474u 
PY  - 2002///
CY  - New Delhi
PB  - Darling Kindersley
KW  - Data Communications
KW  - Computer science
ER  -