Cheetham, N. (2008). Universe: A journey to the edge of the cosmos. Quercus.
Chicago Style aipamenaCheetham, Nicholas. Universe: A Journey to the Edge of the Cosmos. London: Quercus, 2008.
MLA aipamenaCheetham, Nicholas. Universe: A Journey to the Edge of the Cosmos. Quercus, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.