APA (7th ed.) Zitazioa

Coles, P., & Ellis, G. (1997). Is the Universe Open or Closed?: The Density of Matter in the Universe. Cambridge University Press.

Chicago Style (17th ed.) Zitazioa

Coles, Peter, eta George Ellis. Is the Universe Open or Closed?: The Density of Matter in the Universe. Cambridge, United Kingdom: Cambridge University Press, 1997.

MLA (9th ed.) Zitazioa

Coles, Peter, eta George Ellis. Is the Universe Open or Closed?: The Density of Matter in the Universe. Cambridge University Press, 1997.