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APA-viiteUnited Nations. Statistical Division. (2003). Classification by broad economic categories: Defined in terms of the Standard International Trade Classification, revision 3 and the Harmonized Commodity Description and Coding System (2002). United Nations.
Chicago-tyylinen lähdeviittausUnited Nations. Statistical Division. Classification by Broad Economic Categories: Defined in Terms of the Standard International Trade Classification, Revision 3 and the Harmonized Commodity Description and Coding System (2002). New York, [N.Y.]: United Nations, 2003.
MLA-viiteUnited Nations. Statistical Division. Classification by Broad Economic Categories: Defined in Terms of the Standard International Trade Classification, Revision 3 and the Harmonized Commodity Description and Coding System (2002). United Nations, 2003.
Harvard-tyylinen lähdeviittausUnited Nations. Statistical Division. 2003. Classification by broad economic categories: Defined in terms of the Standard International Trade Classification, revision 3 and the Harmonized Commodity Description and Coding System (2002). New York, [N.Y.]: United Nations.