Cita APA (7th ed.)

Hoyle, F. (1963). The nature of the universe. Penguin.

Cita Chicago (17th ed.)

Hoyle, Fred. The Nature of the Universe. Harmondsworth, Middlesex: Penguin, 1963.

Cita MLA (8th ed.)

Hoyle, Fred. The Nature of the Universe. Penguin, 1963.