Marckwardt, A. H. (1969). American English. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Marckwardt, Albert H. American English. New York, Estados Unidos: Oxford University Press, 1969.
Lua MLA (9ú heag.)Marckwardt, Albert H. American English. Oxford University Press, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.