ITU/CCITT <br/><br/>
RED BOOK,VOL VIII,FASCICLE VIII.2: DATA COMMUNICATIONS NETWORKS ...(CCITT STANDARD) 

 - 1 
 - GENEVA  ITU  1985 
 -  73 
<br/><br/><label>ISBN: </label>NCST 
<br/><br/><label>Dewey Class. No.: </label>335