Held, Gil <br/><br/>
Voice & data internetworking  

 - Third Ed.  
 - New York  McGraw Hill  2001 
 - xvii, 397 pages; 23 cm. 
<br/><br/> Includes Index. 
<br/><br/><label>ISBN: </label>0-07-213183-7 
<br/><br/><label>Dewey Class. No.: </label>006.454/H34/2001