Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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