APA (7th ed.) Citation

Clark, H. H. (1967). Transitions in American literary history. Octagon Books.

Chicago Style (17th ed.) Citation

Clark, Harry Hayden. Transitions in American Literary History. New York: Octagon Books, 1967.

MLA (9th ed.) Citation

Clark, Harry Hayden. Transitions in American Literary History. Octagon Books, 1967.