Cita APA (7th ed.)

Eiseley, L. (1969). The unexpected universe. Penguin.

Cita Chicago (17th ed.)

Eiseley, Loren. The Unexpected Universe. Harmondsworth: Penguin, 1969.

Cita MLA (9th ed.)

Eiseley, Loren. The Unexpected Universe. Penguin, 1969.