Edgerton, R. B. (1979). Mental retardation. Harvard University Press.
Lua i Stíl Chicago (17ú heag.)Edgerton, Robert B. Mental Retardation. Cambridge, Mass.: Harvard University Press, 1979.
Lua MLA (8ú heag.)Edgerton, Robert B. Mental Retardation. Harvard University Press, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.