TY  - BOOK
AU  - Held,Gilbert, x
AU  - x
TI  - Understanding data communications: x
SN  - 8120310802
U1  - 001.5544/H474u 
PY  - 1996///
CY  - New Delhi
PB  - Prentice-Hall of India
KW  - Communication
N1  - Includes
ER  -