APA

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

Chicago

Marckwardt Albert H, . 1958. American english. New York: Oxford University Press.

Harvard

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

MLA

Marckwardt Albert H, . American english. New York: Oxford University Press. 1958.