Não informado. (1953). World agricultural situation. U.S. Department of Agriculture, Economic Research Service.
Lua i Stíl Chicago (17ú heag.)Não informado. World Agricultural Situation. Washington: U.S. Department of Agriculture, Economic Research Service, 1953.
Lua MLA (8ú heag.)Não informado. World Agricultural Situation. U.S. Department of Agriculture, Economic Research Service, 1953.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.