APA (7th ed.) Citation

Sagan, F., & Ash, I. (1957). Those without shadows. Penguin Books.

Chicago Style (17th ed.) Citation

Sagan, Francoise, and Irene Ash. Those Without Shadows. Harmondsworth: Penguin Books, 1957.

MLA (9th ed.) Citation

Sagan, Francoise, and Irene Ash. Those Without Shadows. Penguin Books, 1957.

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