एपीए उद्धरण

(1990). Agronomy abstracts: 1990 annual meetings. Texas: American Society of Agronomy.

शिकागो स्टाइल उद्धरण

Agronomy Abstracts: 1990 Annual Meetings. Texas: American Society of Agronomy, 1990.

एमएलए उद्धरण

Agronomy Abstracts: 1990 Annual Meetings. Texas: American Society of Agronomy, 1990.