APA (7th ed.) Citation

Feuchtwanger, L., Muir, W., & Muir, E. (1928). The ugly duchess. Viking.

Chicago Style (17th ed.) Citation

Feuchtwanger, Lion, Willa Muir, and Edwin Muir. The Ugly Duchess. New York: Viking, 1928.

MLA (8th ed.) Citation

Feuchtwanger, Lion, et al. The Ugly Duchess. Viking, 1928.