J Ris. (1973). The establishment of fertilizer recommendations on the basis of soil tests. The Netherland: Instituut Voor Bodemvruchtbaarheid.
शिकागो स्टाइल उद्धरणJ Ris. The Establishment of Fertilizer Recommendations On the Basis of Soil Tests. The Netherland: Instituut Voor Bodemvruchtbaarheid, 1973.
एमएलए उद्धरणJ Ris. The Establishment of Fertilizer Recommendations On the Basis of Soil Tests. The Netherland: Instituut Voor Bodemvruchtbaarheid, 1973.
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