Griffiths John M. <br/><br/>
Isdn Explained  Worldwide Network and Applications Technology 

 - Second Edition 
 - New Work  JOhn Wiley & Sons  1990 
 - xiv, 239p 
<br/><br/><label>ISBN: </label>0471934801 
<br/><br/><label>Dewey Class. No.: </label>621-382  / G87I