Não informado. (1939). Feed situation. U.S. Department of Agriculture, Bureau of Agricultural Economics.
Lua i Stíl Chicago (17ú heag.)Não informado. Feed Situation. Washington: U.S. Department of Agriculture, Bureau of Agricultural Economics, 1939.
Lua MLA (8ú heag.)Não informado. Feed Situation. U.S. Department of Agriculture, Bureau of Agricultural Economics, 1939.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.