Stallings, William. <br/><br/>
Data and computer communications / 
William Stallings. 
 - 9th ed. 
 - Upper Saddle River, NJ :  Pearson,  c2011. 
 - 881 p. :.  ill ;  25 cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780132172172 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems.<br/>Computer networks.
<br/><br/><label>Dewey Class. No.: </label>004.6