APA (7th ed.) Citation

Twain, M., Wager, W., & Benton, T. H. (1944). Life on the Mississippi. The Heritage Press.

Chicago Style (17th ed.) Citation

Twain, Mark, Willis Wager, and Thomas Hart Benton. Life on the Mississippi. New York: The Heritage Press, 1944.

MLA (9th ed.) Citation

Twain, Mark, et al. Life on the Mississippi. The Heritage Press, 1944.