APA (7th ed.) Citation

Mencken, H. L. (1923). The American language: An inquiry into the development of English in the United States. A. A. Knopf.

Chicago Style (17th ed.) Citation

Mencken, H. L. The American Language: An Inquiry into the Development of English in the United States. New York: A. A. Knopf, 1923.

MLA (9th ed.) Citation

Mencken, H. L. The American Language: An Inquiry into the Development of English in the United States. A. A. Knopf, 1923.