Standard international trade classification. 

 - Revision 4. 
 - New York:   United Nations,   2006.  
 - xii, 179 p.  28 cm.  
 -  34 / Rev. 4 .
<br/><br/> Department of Economic and Social Affairs, Statistical Division 
<br/><br/><label>ISBN: </label>9211614937 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Commerce--Classification<br/>Commercial products--Classification