International Development Research Center. Agriculture. Food and Nutrition Sciences Division. (1988). Crop and animal production systems program. International Development Research Centre.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Development Research Center. Agriculture. Food and Nutrition Sciences Division. Crop and Animal Production Systems Program. Ottawa, Ont: International Development Research Centre, 1988.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)International Development Research Center. Agriculture. Food and Nutrition Sciences Division. Crop and Animal Production Systems Program. International Development Research Centre, 1988.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.