APA (7th ed.) Citation

Gordon, R., Forge, A., & Howard, R. (1988). Degas. Abrams.

Chicago Style (17th ed.) Citation

Gordon, Robert, Andrew Forge, and Richard Howard. Degas. New York: Abrams, 1988.

MLA (9th ed.) Citation

Gordon, Robert, et al. Degas. Abrams, 1988.