Cita APA (7a ed.)

Marckwardt, A. H. (1980). American English (2nd ed.). Oxford University Press.

Cita Chicago Style (17a ed.)

Marckwardt, Albert Henry. American English. 2nd ed. New York [etc.]: Oxford University Press, 1980.

Cita MLA (9a ed.)

Marckwardt, Albert Henry. American English. 2nd ed. Oxford University Press, 1980.