Green, T. (2002). The fourth perimeter. Warner Books.
Lua i Stíl Chicago (17ú heag.)Green, Tim. The Fourth Perimeter. New York: Warner Books, 2002.
Lua MLA (9ú heag.)Green, Tim. The Fourth Perimeter. Warner Books, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.