Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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