United States. Dept. of Agriculture. Economic Research Service. World economic conditions in relation to agricultural trade. U.S. Dept. of Agriculture, Economic Research Service.
芝加哥风格引文United States. Dept. of Agriculture. Economic Research Service. World Economic Conditions in Relation to Agricultural Trade. [Washington]: U.S. Dept. of Agriculture, Economic Research Service.
MLA引文United States. Dept. of Agriculture. Economic Research Service. World Economic Conditions in Relation to Agricultural Trade. U.S. Dept. of Agriculture, Economic Research Service.
警告：这些引文格式不一定是100％准确.