Não informado. (1920). Milk Industry. National Dairymen's Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Milk Industry. London: National Dairymen's Association, 1920.
Lua MLA (8ú heag.)Não informado. Milk Industry. National Dairymen's Association, 1920.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.