Não informado. (1950). Yearbook of International Trade Statistics. United Nations.
Chicagoスタイル(17版)引用形式Não informado. Yearbook of International Trade Statistics. New York: United Nations, 1950.
MLA(8版)引用形式Não informado. Yearbook of International Trade Statistics. United Nations, 1950.
警告: この引用は必ずしも正確ではありません.