APA (7th ed.) Citation

Smart, W. M. (1955). The origin of the Earth. Penguin.

Chicago Style (17th ed.) Citation

Smart, W. M. The Origin of the Earth. Harmondsworth: Penguin, 1955.

MLA (8th ed.) Citation

Smart, W. M. The Origin of the Earth. Penguin, 1955.

Warning: These citations may not always be 100% accurate.