Gregory, R. L. (1973). Eye and brain: The psychology of seeing (2nd ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Gregory, Richard Langton. Eye and Brain: The Psychology of Seeing. 2nd ed. New York: McGraw-Hill, 1973.
Lua MLA (9ú heag.)Gregory, Richard Langton. Eye and Brain: The Psychology of Seeing. 2nd ed. McGraw-Hill, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.