TY  - BOOK
AU  - Croucher,Phil
TI  - Communications & networks: a handbook for the first time user 
SN  - 1850581363 (pbk)
PY  - 1989///
CY  - Wilmslow : 
PB  - Sigma, 
KW  - Computer networks
N1  - Bibliography: p155. _ Includes index
ER  -