एपीए उद्धरण

(1982). Nitrogen in agricultural soils. Wisconsin, USA: American Society of Agronomy, Inc.

शिकागो स्टाइल उद्धरण

Nitrogen in Agricultural Soils. Wisconsin, USA: American Society of Agronomy, Inc, 1982.

एमएलए उद्धरण

Nitrogen in Agricultural Soils. Wisconsin, USA: American Society of Agronomy, Inc, 1982.