APA (7e ed.) Bronvermelding

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 (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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