Held, Gil <br/><br/>
Voice & Data  Internetworking 
Gil Held. 
 - 3th ed. 
 - New York  McGraw-Hill  2001. 
 - xviii, 397 p.  ill.  24 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0072131837 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital telephone systems.<br/>Computer networks
<br/><br/><label>Dewey Class. No.: </label>621.385  / H474v3 2001