British Standard Instiute,   . <br/><br/>
Universal decimal classification /  
British Standard Institute. 
 - 2nd ed /   . 
 - London :   BSI standard ,   1993. 
 - NULL :   ill ;   NULL .  
<br/><br/>NULL 
<br/><br/><label>ISBN: </label> NULL (Pbk) 
<br/><br/><label>Subjects--Index Terms: </label>UNIVERSAL DECIMAL CLASSIFICATIONS (UDC) 
<br/><br/><label>Dewey Class. No.: </label>023.432  /