APA (7e ed.) Bronvermelding

Marckwardt, A. H. (1951). Introduction to the English language. [s.n..

Chicago (17e ed.) Bronvermelding

Marckwardt, Albert H. Introduction to the English Language. New York: [s.n., 1951.

MLA (8e ed.) Bronvermelding

Marckwardt, Albert H. Introduction to the English Language. [s.n., 1951.