Não informado. (1978). Rural Development Perspectives. U.S. Department of Agriculture, Economics, Statistics and Cooperative Service.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Rural Development Perspectives. Washington: U.S. Department of Agriculture, Economics, Statistics and Cooperative Service, 1978.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Rural Development Perspectives. U.S. Department of Agriculture, Economics, Statistics and Cooperative Service, 1978.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.