APA (7th ed.) Citation

Smith, R. (2006). The Utility of force: The art of war in the modern world. Penguin books.

Chicago Style (17th ed.) Citation

Smith, Rupert. The Utility of Force: The Art of War in the Modern World. London ; New York: Penguin books, 2006.

MLA (9th ed.) Citation

Smith, Rupert. The Utility of Force: The Art of War in the Modern World. Penguin books, 2006.