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.
Lua i Stíl Chicago (17ú heag.)Barrett, Kevin, Saul Peters, John David Ruemmler, Angus McBride, Carolyn Savoy, Gerald Forton, agus J. R. R. Tolkien. Treason at Helms Deep. New York, N.Y.: Berkley Pub. Group, 1988.
Lua MLA (8ú heag.)Barrett, Kevin, et al. Treason at Helms Deep. Berkley Pub. Group, 1988.
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