Freer J R <br/><br/>
Computer communication and networks 
Freer J R 
 - London  Pitman           1988 
 - 432p.  cm. 
<br/><br/><label>Standard No.: </label>32521 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D65,8(B):(P), M8