APA (7th ed.) Citation

Clark, A. L. (1924). Why the Ku Klux Klan? [A. L. Clark].

Chicago Style (17th ed.) Citation

Clark, Abraham Lincoln. Why the Ku Klux Klan? Spokane, Wash.: [A. L. Clark], 1924.

MLA (9th ed.) Citation

Clark, Abraham Lincoln. Why the Ku Klux Klan? [A. L. Clark], 1924.