Não informado. (1950). Yearbook of International Trade Statistics. United Nations.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Yearbook of International Trade Statistics. New York: United Nations, 1950.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Yearbook of International Trade Statistics. United Nations, 1950.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.