Stallings, Wiliam <br/><br/>
Data and computer communications / 
William Stallings 
 - Ninth Edition. 
 - Harlow, Essex, England :  Pearson,  c2011 
 - xxv, 853 pages :  illustrations ;  24 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>9780131392052 
<br/><br/><label>Subjects--Topical Terms: </label><br/>COMPUTER NETWORKS
<br/><br/><label>LC Class. No.: </label>TK 5105 .S73 2011