International Monetary Fund. Statistics Dept. (1981). Direction of Trade Statistics Yearbook, 1981 Edition. International Monetary Fund.
Citação do estilo Chicago (17ª ed.)International Monetary Fund. Statistics Dept. Direction of Trade Statistics Yearbook, 1981 Edition. Washington, D.C.: International Monetary Fund, 1981.
Citação MLA (8ª ed.)International Monetary Fund. Statistics Dept. Direction of Trade Statistics Yearbook, 1981 Edition. International Monetary Fund, 1981.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.