Lua APA (7ú heag.)
Hillman, B. (1989). Fortress. Wesleyan University Press.
Lua i Stíl Chicago (17ú heag.)
Hillman, Brenda. Fortress. Middletown, Conn.: Wesleyan University Press, 1989.
Lua MLA (9ú heag.)
Hillman, Brenda. Fortress. Wesleyan University Press, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.