TY  - BOOK
AU  - Penfold,R.A.
TI  - An introduction to computer communications
SN  - 0859341518
U1  - TK/5105.5 
PY  - 1986///
CY  - Shepherds bush road, London
PB  - Bernard Babani pub.Ltd.
KW  - Computer networks.
ER  -