United States. Dept. of Agriculture. Economic Research Service, United States. World Agricultural Outlook Board, United States. Foreign Agricultural Service, United States. Dept. of Agriculture. Economics, Statistics, and Cooperatives Service, & United States. World Food and Agricultural Outlook and Situation Board. (1979). Foreign agriculture circular. Foreign Agricultural Service.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Dept. of Agriculture. Economic Research Service, United States. World Agricultural Outlook Board, United States. Foreign Agricultural Service, Statistics United States. Dept. of Agriculture. Economics, و United States. World Food and Agricultural Outlook and Situation Board. Foreign Agriculture Circular. Washington, D.C.: Foreign Agricultural Service, 1979.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. Dept. of Agriculture. Economic Research Service, et al. Foreign Agriculture Circular. Foreign Agricultural Service, 1979.