Summers Ch. K. <br/><br/>
ISDN Implementor`s Guide:  Standards, protocols, and services  [Text] 

 - New York:  Mcgraw-Hill,  1995. 
 - 414 p. 
<br/><br/> n/15082 
<br/><br/><label>ISBN: </label>0-07-069416-8