Held, Gill. <br/><br/>
Voice and data internetworking  

 - 3rd edition. 
 - Delhi :  Tata Mcgraw Hill Publishing Company Ltd,  1994 
 - 397. 
<br/><br/><label>ISBN: </label>0070447446  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data processing computer science
<br/><br/><label>Dewey Class. No.: </label>004.678  / HEL