APA

Marckwardt A. H., . (1958). American English. New York: Oxford University Press.

Chicago

Marckwardt Albert Henry, . 1958. American English. New York: Oxford University Press.

Harvard

Marckwardt A. H., . (1958). American English. New York: Oxford University Press.

MLA

Marckwardt Albert Henry, . American English. New York: Oxford University Press. 1958.