Não informado. (1950). Agronomy abstracts. American Society of Agronomy.
Lua i Stíl Chicago (17ú heag.)Não informado. Agronomy Abstracts. Madison, Wis: American Society of Agronomy, 1950.
Lua MLA (8ú heag.)Não informado. Agronomy Abstracts. American Society of Agronomy, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.