Hartwell, D. Dogs against darkness: The story of the Seeing Eye. Rich & Cowan.
Lua i Stíl Chicago (17ú heag.)Hartwell, Dickson. Dogs Against Darkness: The Story of the Seeing Eye. London: Rich & Cowan.
Lua MLA (8ú heag.)Hartwell, Dickson. Dogs Against Darkness: The Story of the Seeing Eye. Rich & Cowan.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.