International Symposium on Soil Fertility Evaluation New Delhi, India. (1971). International Symposium on Soil Fertility Evaluation proceedings. Indian Society of Soil Science Indian Agricultural Research Institute.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Symposium on Soil Fertility Evaluation New Delhi, India. International Symposium on Soil Fertility Evaluation Proceedings. New Dehli: Indian Society of Soil Science Indian Agricultural Research Institute, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International Symposium on Soil Fertility Evaluation New Delhi, India. International Symposium on Soil Fertility Evaluation Proceedings. Indian Society of Soil Science Indian Agricultural Research Institute, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.