Não informado. (1953). Agricultural Research. Agricultural Research Service.
Lua i Stíl Chicago (17ú heag.)Não informado. Agricultural Research. Washington: Agricultural Research Service, 1953.
Lua MLA (8ú heag.)Não informado. Agricultural Research. Agricultural Research Service, 1953.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.