Não informado. (1919). Journal of Farm Economics. American Farm Economic Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Farm Economics. Menasha, Wis: American Farm Economic Association, 1919.
Lua MLA (8ú heag.)Não informado. Journal of Farm Economics. American Farm Economic Association, 1919.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.