International Monetary Fund. (1981). Direction of trade statistics. International Monetary Fund.
Chicagoスタイル(17版)引用形式International Monetary Fund. Direction of Trade Statistics. Washington, D.C.: International Monetary Fund, 1981.
MLA(8版)引用形式International Monetary Fund. Direction of Trade Statistics. International Monetary Fund, 1981.
警告: この引用は必ずしも正確ではありません.