APA (7th ed.) Citation

Kaplan, J. (1966). Mr. Clemens and Mark Twain: A biography. Simon and Schuster.

Chicago Style (17th ed.) Citation

Kaplan, Justin. Mr. Clemens and Mark Twain: A Biography. New York: Simon and Schuster, 1966.

MLA (9th ed.) Citation

Kaplan, Justin. Mr. Clemens and Mark Twain: A Biography. Simon and Schuster, 1966.