Utgard, R. O. (1974). Man's finite earth. Burgess Publishing.
Lua i Stíl Chicago (17ú heag.)Utgard, Russell O. Man's Finite Earth. Minneapolis: Burgess Publishing, 1974.
Lua MLA (9ú heag.)Utgard, Russell O. Man's Finite Earth. Burgess Publishing, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.