SUMMERS, Charles K. <br/><br/>
ISDN implementor's guide:standards,protocols&services 

 - Newyork.  Mcgraw-hill  1995 
 - xviii, 413 
<br/><br/><label>ISBN: </label>0-07-069416-8 
<br/><br/><label>Dewey Class. No.: </label>4.62