Iowa State University. Cooperative Extension Service. Dairy Husbandry and Dairy Products Extension Service publications and records.
Lua i Stíl Chicago (17ú heag.)Iowa State University. Cooperative Extension Service. Dairy Husbandry and Dairy Products Extension Service Publications and Records.
Lua MLA (8ú heag.)Iowa State University. Cooperative Extension Service. Dairy Husbandry and Dairy Products Extension Service Publications and Records.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.