Não informado. (1937). Foreign agriculture. U.S. Department of Agriculture, Foreign Agricultural Service.
Lua i Stíl Chicago (17ú heag.)Não informado. Foreign Agriculture. Washington: U.S. Department of Agriculture, Foreign Agricultural Service, 1937.
Lua MLA (8ú heag.)Não informado. Foreign Agriculture. U.S. Department of Agriculture, Foreign Agricultural Service, 1937.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.