APA (7th ed.) Citation

Regan, R. (1966). Unpromising heroes: Mark Twain and his characters. University of California Press.

Chicago Style (17th ed.) Citation

Regan, Robert. Unpromising Heroes: Mark Twain and His Characters. Berkeley: University of California Press, 1966.

MLA (9th ed.) Citation

Regan, Robert. Unpromising Heroes: Mark Twain and His Characters. University of California Press, 1966.