(1982). Nitrogen in agricultural soils. Wisconsin, USA: American Society of Agronomy, Inc.
शिकागो स्टाइल उद्धरणNitrogen in Agricultural Soils. Wisconsin, USA: American Society of Agronomy, Inc, 1982.
एमएलए उद्धरणNitrogen in Agricultural Soils. Wisconsin, USA: American Society of Agronomy, Inc, 1982.
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