Bellamy J.C., <br/><br/>
Digital Telephony   Textual Documents 

 - 3 rd ed . 
 - Singapore  John Wiley & Sons (Asia) Pte. Ltd.,  2010 
 - 643:  xxv;  23*15. 
<br/><br/><label>ISBN: </label>9788126509294   
<br/><br/><label>Dewey Class. No.: </label>621.385  / BEL