(1961). Standard international trade classification, revised. New York: United Nations. Department of Economic and Social Affairs. Statistical Office.
Παραπομπή Chicago StyleStandard International Trade Classification, Revised. New York: United Nations. Department of Economic and Social Affairs. Statistical Office, 1961.
Παραπομπή MLAStandard International Trade Classification, Revised. New York: United Nations. Department of Economic and Social Affairs. Statistical Office, 1961.
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