APA

Marckwardt A. H., Dillard J. L., . (1980). American English. New York: Oxford University Press.

Chicago

Marckwardt Albert Henry, Dillard J L, . 1980. American English. New York: Oxford University Press.

Harvard

Marckwardt A. H., Dillard J. L., . (1980). American English. New York: Oxford University Press.

MLA

Marckwardt Albert Henry, Dillard J L, . American English. New York: Oxford University Press. 1980.