Não informado. (2001). International Trade Statistics Yearbook. United Nations.
Chicagoスタイル(17版)引用形式Não informado. International Trade Statistics Yearbook. New York: United Nations, 2001.
MLA(8版)引用形式Não informado. International Trade Statistics Yearbook. United Nations, 2001.
警告: この引用は必ずしも正確ではありません.