The gilded age;
a tale of today,
by Mark Twain [pseud.] and Charles Dudley Warner.
Twain, M., Warner, C. Dudley. (1915). The gilded age: a tale of today. New York: Grosset & Dunlap.
Twain, Mark, 1835-1910, and Charles Dudley Warner. The Gilded Age: a Tale of Today. New York: Grosset & Dunlap, 1915.
Warning: These citations may not always be complete (especially for serials).