APA (7th ed.) Citation

Carrell, A. (1939). Man, the unknown: Containing a new introduction. Harper.

Chicago Style (17th ed.) Citation

Carrell, Alexis. Man, the Unknown: Containing a New Introduction. New York: Harper, 1939.

MLA (9th ed.) Citation

Carrell, Alexis. Man, the Unknown: Containing a New Introduction. Harper, 1939.