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