Stallings, William. <br/><br/>
Data and computer communications / 
William Stallings 
 - [Place of publication not identifed] :  [publisher not identified],  c1985 
<br/><br/> Data and computer communications, Data 
<br/><br/><label>ISBN: </label>24154407 
<br/><br/><label>LC Class. No.: </label>TK 5105 .S73 1985