Marckwardt, A. H. (1969). American English. Oxford University Press.
Cita Chicago Style (17a ed.)Marckwardt, Albert H. American English. New York, Estados Unidos: Oxford University Press, 1969.
Cita MLA (9a ed.)Marckwardt, Albert H. American English. Oxford University Press, 1969.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
