APA (7th ed.) Zitazioa

Irion, R. (2001). Galaxies: Island universes. Reader's Digest.

Chicago Style (17th ed.) Zitazioa

Irion, Robert. Galaxies: Island Universes. Pleasantville: Reader's Digest, 2001.

MLA (9th ed.) Zitazioa

Irion, Robert. Galaxies: Island Universes. Reader's Digest, 2001.