Data communication 
D.C. Green. 
 -  Loongman Group UK Limited.  1991 
 - 206 pages. 
<br/><br/>
<br/><br/><label>ISBN: </label>0-582-06005-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission.
<br/><br/><label>Dewey Class. No.: </label>004.6 g82d 1991