APA (7th ed.) Citation

Twain, M. (1997). The unabridged Mark Twain. Courage Books.

Chicago Style (17th ed.) Citation

Twain, Mark. The Unabridged Mark Twain. Philadelphia, Pa.: Courage Books, 1997.

MLA (9th ed.) Citation

Twain, Mark. The Unabridged Mark Twain. Courage Books, 1997.