Não informado. (1989). UNCTAD review. United Nations Conference on Trade and Development.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. UNCTAD Review. Geneva, Suíça: United Nations Conference on Trade and Development, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. UNCTAD Review. United Nations Conference on Trade and Development, 1989.
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