International Monetary Fund. (1981). Direction of trade statistics. International Monetary Fund.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रInternational Monetary Fund. Direction of Trade Statistics. Washington, D.C.: International Monetary Fund, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रInternational Monetary Fund. Direction of Trade Statistics. International Monetary Fund, 1981.
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