Gregory, R. L. (1966). Eye and brain: The psychology of seeing. Weidenfeld and Nicolson.
Lua i Stíl Chicago (17ú heag.)Gregory, Richard Langton. Eye and Brain: The Psychology of Seeing. London: Weidenfeld and Nicolson, 1966.
Lua MLA (9ú heag.)Gregory, Richard Langton. Eye and Brain: The Psychology of Seeing. Weidenfeld and Nicolson, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.