Cita APA (7a ed.)

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.