SEED, M. A. (1985). Hoeizons: Exploring the universe.-- ed.2. Wasworth pub.
Lua i Stíl Chicago (17ú heag.)SEED, Michael A. Hoeizons: Exploring the Universe.-- Ed.2. Belmont: Wasworth pub, 1985.
Lua MLA (9ú heag.)SEED, Michael A. Hoeizons: Exploring the Universe.-- Ed.2. Wasworth pub, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.