(1959). Indexes to the International Standard Industrial Classification of all economic activities. New York: United Nations. Statistical Office.
Παραπομπή Chicago StyleIndexes to the International Standard Industrial Classification of All Economic Activities. New York: United Nations. Statistical Office, 1959.
Παραπομπή MLAIndexes to the International Standard Industrial Classification of All Economic Activities. New York: United Nations. Statistical Office, 1959.
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