Não informado. (1971). American bibliography of agricultural economics. University of Kentucky, Department of Agricultural Economics, American Agricultural Economics.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. American Bibliography of Agricultural Economics. Lexington, Ky: University of Kentucky, Department of Agricultural Economics, American Agricultural Economics, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. American Bibliography of Agricultural Economics. University of Kentucky, Department of Agricultural Economics, American Agricultural Economics, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.