APA (7th ed.) Citation

Twain, M., & Paine, A. B. (1920). Moments with Mark Twain. Harper.

Chicago Style (17th ed.) Citation

Twain, Mark, and Albert Bigelow Paine. Moments with Mark Twain. New York: Harper, 1920.

MLA (9th ed.) Citation

Twain, Mark, and Albert Bigelow Paine. Moments with Mark Twain. Harper, 1920.