Fraknoi, A., Morrison, D., & Wolff, S. (2004). Voyages through the universe (3rd ed.). Thomson.
Lua i Stíl Chicago (17ú heag.)Fraknoi, Andrew, David Morrison, agus Sidney Wolff. Voyages Through the Universe. 3rd ed. Belmont, CA: Thomson, 2004.
Lua MLA (8ú heag.)Fraknoi, Andrew, et al. Voyages Through the Universe. 3rd ed. Thomson, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.