International Monetary Fund. Statistics Dept. Real Sector Division. (1993). A Guide to Direction of trade statistics. International Monetary Fund.
Cita Chicago (17th ed.)International Monetary Fund. Statistics Dept. Real Sector Division. A Guide to Direction of Trade Statistics. Washington, D. C: International Monetary Fund, 1993.
Cita MLA (9th ed.)International Monetary Fund. Statistics Dept. Real Sector Division. A Guide to Direction of Trade Statistics. International Monetary Fund, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.