APA (7th ed.) Citation

Twain, M., & Hill, H. L. (1985). Roughing it. Penguin.

Chicago Style (17th ed.) Citation

Twain, Mark, and Hamlin Lewis Hill. Roughing It. New York, N.Y.: Penguin, 1985.

MLA (9th ed.) Citation

Twain, Mark, and Hamlin Lewis Hill. Roughing It. Penguin, 1985.