Guide to ISDN 
Benton ,Ian 
 - England  Oxford  1991 
 - 100p. 
<br/><br/> Incl.Glossary 
<br/><br/><label>ISBN: </label>0850128269 
<br/><br/><label>Subjects--Topical Terms: </label>
<br/><br/><label>LC Class. No.: </label>TK 5101  / .B 46 1991