Não informado. (1977). Crops and soils magazine. American Society of Agronomy.
Lua i Stíl Chicago (17ú heag.)Não informado. Crops and Soils Magazine. Madison, Wis: American Society of Agronomy, 1977.
Lua MLA (8ú heag.)Não informado. Crops and Soils Magazine. American Society of Agronomy, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.