US Department of Agriculture. (1956). Agricultural marketing. U.S. Department of Agriculture, Agricultural Marketing Service.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)US Department of Agriculture. Agricultural Marketing. Washington: U.S. Department of Agriculture, Agricultural Marketing Service, 1956.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)US Department of Agriculture. Agricultural Marketing. U.S. Department of Agriculture, Agricultural Marketing Service, 1956.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.