Gregory, R. L. (1990). Eye and Brain: The Psychology of Seeing (4th ed.). Princeton University Press.
Lua i Stíl Chicago (17ú heag.)Gregory, Richard L. Eye and Brain: The Psychology of Seeing. 4th ed. New Jersey: Princeton University Press, 1990.
Lua MLA (9ú heag.)Gregory, Richard L. Eye and Brain: The Psychology of Seeing. 4th ed. Princeton University Press, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.