APA (7th ed.) Citation

Barrett, K., Peters, S., Ruemmler, J. D., McBride, A., Savoy, C., Forton, G., & Tolkien, J. R. R. (1988). Treason at Helms Deep. Berkley Pub. Group.

Chicago Style (17th ed.) Citation

Barrett, Kevin, Saul Peters, John David Ruemmler, Angus McBride, Carolyn Savoy, Gerald Forton, and J. R. R. Tolkien. Treason at Helms Deep. New York, N.Y.: Berkley Pub. Group, 1988.

MLA (8th ed.) Citation

Barrett, Kevin, et al. Treason at Helms Deep. Berkley Pub. Group, 1988.