APA (7th ed.) Citation

Twain, M., & Warner, C. D. (1901). The gilded age: A tale of today. Harper.

Chicago Style (17th ed.) Citation

Twain, Mark, and Charles Dudley Warner. The Gilded Age: A Tale of Today. New York: Harper, 1901.

MLA (8th ed.) Citation

Twain, Mark, and Charles Dudley Warner. The Gilded Age: A Tale of Today. Harper, 1901.