APA (7th ed.) Citation

Hoyle, F., & Holey, G. (1963). Fifth planet. Penguin Books.

Chicago Style (17th ed.) Citation

Hoyle, Fred, and Geoffrey Holey. Fifth Planet. Harmondsworth: Penguin Books, 1963.

MLA (9th ed.) Citation

Hoyle, Fred, and Geoffrey Holey. Fifth Planet. Penguin Books, 1963.