Não informado. (1910). Guernsey Breeders Journal. American Guernsey Cattle Club.
Lua i Stíl Chicago (17ú heag.)Não informado. Guernsey Breeders Journal. Columbus, Ohio: American Guernsey Cattle Club, 1910.
Lua MLA (8ú heag.)Não informado. Guernsey Breeders Journal. American Guernsey Cattle Club, 1910.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.