Eastlake, W. (1965). Castle keep. Simon and Schuster.
Lua i Stíl Chicago (17ú heag.)Eastlake, William. Castle Keep. New York: Simon and Schuster, 1965.
Lua MLA (9ú heag.)Eastlake, William. Castle Keep. Simon and Schuster, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.