Arny, T. (2004). Explorations: Stars, galaxies, and planets (Updated ed.). McGraw-Hill.
Chicago Style aipamenaArny, Thomas. Explorations: Stars, Galaxies, and Planets. Updated ed. Boston: McGraw-Hill, 2004.
MLA aipamenaArny, Thomas. Explorations: Stars, Galaxies, and Planets. Updated ed. McGraw-Hill, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.