Não informado. (1981). Balance of Payments Statistics Yearbook. International Monetary Fund.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Balance of Payments Statistics Yearbook. Washington: International Monetary Fund, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Balance of Payments Statistics Yearbook. International Monetary Fund, 1981.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.