Foster, R. (1974). A guide to Middle Earth. Ballantine Books.
Lua i Stíl Chicago (17ú heag.)Foster, Robert. A Guide to Middle Earth. N.Y.: Ballantine Books, 1974.
Lua MLA (8ú heag.)Foster, Robert. A Guide to Middle Earth. Ballantine Books, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.