APA (7th ed.) Citation

Hooton, E. A. (1939). Twilight of man. Putnam's.

Chicago Style (17th ed.) Citation

Hooton, Earnest Albert. Twilight of Man. New York: Putnam's, 1939.

MLA (9th ed.) Citation

Hooton, Earnest Albert. Twilight of Man. Putnam's, 1939.

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