CCITT <br/><br/>
BLUE BOOK,VOL.VIII.4: DATA COMMUNICATION NETWORKS:OPEN SYSTEMS INTERCONNECTION MODEL AND NOTATION RE 

 - GENEVA  ITU  1989 
 -  502 
<br/><br/> GRATIS 
<br/><br/><label>ISBN: </label>ERNET 
<br/><br/><label>Dewey Class. No.: </label>335