APA (7th ed.) Zitazioa

Asimov, I. (1966). The Universe: From flat earth to Quasar. Walker.

Chicago Style (17th ed.) Zitazioa

Asimov, Isaac. The Universe: From Flat Earth to Quasar. New York: Walker, 1966.

MLA (9th ed.) Zitazioa

Asimov, Isaac. The Universe: From Flat Earth to Quasar. Walker, 1966.