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.
Chicago-referens (17:e uppl.)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.
MLA-referens (8:e uppl.)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.
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