APA (7th ed.) Citation

Nicolai, G. F. (1918). The biology of war. Century.

Chicago Style (17th ed.) Citation

Nicolai, Georg Friedrich. The Biology of War. New York: Century, 1918.

MLA (8th ed.) Citation

Nicolai, Georg Friedrich. The Biology of War. Century, 1918.

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