Não informado. (2002). Purebred picture. American Berkshire Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Purebred Picture. West Lafayette, Ind: American Berkshire Association, 2002.
Lua MLA (8ú heag.)Não informado. Purebred Picture. American Berkshire Association, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.