APA (7th ed.) Citation

Twain, M., & Warner, C. D. (1964). The gilded age: A tale of today. Trident Press.

Chicago Style (17th ed.) Citation

Twain, Mark, and Charles Dudley Warner. The Gilded Age: A Tale of Today. New York: Trident Press, 1964.

MLA (9th ed.) Citation

Twain, Mark, and Charles Dudley Warner. The Gilded Age: A Tale of Today. Trident Press, 1964.