Bortz Fred. Cool Science Astrobiology. Lerner.
Lua i Stíl Chicago (17ú heag.)Bortz Fred. Cool Science Astrobiology. 2008 2008: Lerner.
Lua MLA (9ú heag.)Bortz Fred. Cool Science Astrobiology. Lerner.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.