Stallings, William <br/><br/>
Business Data Communications 
William Stallings 
 - 5th ed. 
 - United States  Pearson  2005 
 - xviii, 584p. 
<br/><br/> incl.ill and indexes 
<br/><br/><label>ISBN: </label>9780131442573 
<br/><br/><label>LC Class. No.: </label>HF 5548.2  / .S7724 2004