CCITT <br/><br/>
BLUE BOOK,VOLUME VIII,FASCICLE VIII.2;DATA COMMUNICATION NETWORKS:SERVICES AND FACILITIES,INTERFACES 

 - GENEVA  ITU  1989 
 -  539 
<br/><br/> SC-022 
<br/><br/><label>ISBN: </label>ERNET 
<br/><br/><label>Dewey Class. No.: </label>1135