APA

Crawford D. G., . (1919). The study of English. New York: Macmillan.

Chicago

Crawford Douglas Gordon, . 1919. The study of English. New York: Macmillan.

Harvard

Crawford D. G., . (1919). The study of English. New York: Macmillan.

MLA

Crawford Douglas Gordon, . The study of English. New York: Macmillan. 1919.