APA (7th ed.) Citation

Kaplan, F. (2003). The singular Mark Twain: A biography. Doubleday.

Chicago Style (17th ed.) Citation

Kaplan, Fred. The Singular Mark Twain: A Biography. New York: Doubleday, 2003.

MLA (9th ed.) Citation

Kaplan, Fred. The Singular Mark Twain: A Biography. Doubleday, 2003.