Não informado. (1972). Journal of agronomic education. American Society of Agronomy.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Agronomic Education. Madison, Wis: American Society of Agronomy, 1972.
Lua MLA (8ú heag.)Não informado. Journal of Agronomic Education. American Society of Agronomy, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.