BATES, REGIS J <br/><br/>
VOICE AND DATA COMMUNICATIONS HAND BOOK  

 - 4 ed. 
 - NEW DELHI  TMH  2001 
 - 1074 
<br/><br/><label>ISBN: </label>0-07-047281-5 
<br/><br/><label>Dewey Class. No.: </label>004.6 O 01 BAT/GRE