Elkins, J. (1999). Why are pictures puzzles?: On the modern origins of pictorial complexity. Routledge.
Lua i Stíl Chicago (17ú heag.)Elkins, James. Why Are Pictures Puzzles?: On the Modern Origins of Pictorial Complexity. New York: Routledge, 1999.
Lua MLA (9ú heag.)Elkins, James. Why Are Pictures Puzzles?: On the Modern Origins of Pictorial Complexity. Routledge, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.