APA (7th ed.) Citation

Carrel, A. (1948). Man, the unknown. Penguin Books.

Chicago Style (17th ed.) Citation

Carrel, Alexis. Man, the Unknown. New York: Penguin Books, 1948.

MLA (9th ed.) Citation

Carrel, Alexis. Man, the Unknown. Penguin Books, 1948.

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