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