Green, G. (1969). Read, think & answer. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Green, Gordon. Read, Think & Answer. London: Oxford University Press, 1969.
Lua MLA (9ú heag.)Green, Gordon. Read, Think & Answer. Oxford University Press, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.