Não informado. (1971). Industrial Development Abstracts. United Nations, Industrial Development Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Industrial Development Abstracts. New York: United Nations, Industrial Development Organization, 1971.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Industrial Development Abstracts. United Nations, Industrial Development Organization, 1971.
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