Não informado. (2002). Industrial Commodity Statistics Yearbook. United Nations.
Chicagoスタイル(17版)引用形式Não informado. Industrial Commodity Statistics Yearbook. New York: United Nations, 2002.
MLA(8版)引用形式Não informado. Industrial Commodity Statistics Yearbook. United Nations, 2002.
警告: この引用は必ずしも正確ではありません.