United States. Dept. of Agriculture. Economic Research Service, United States. Dept. of Agriculture. Economics and Statistics Service, & United States. World Food and Agricultural Outlook and Situation Board. (1981). Wheat outlook & situation. The Service.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)United States. Dept. of Agriculture. Economic Research Service, United States. Dept. of Agriculture. Economics and Statistics Service, và United States. World Food and Agricultural Outlook and Situation Board. Wheat Outlook & Situation. [Washington, D.C.]: The Service, 1981.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)United States. Dept. of Agriculture. Economic Research Service, et al. Wheat Outlook & Situation. The Service, 1981.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.