APA (7th ed.) Citation

Hart. (2004). The fourth power: A grand strategy for the United States in the twenty-first century. Oxford University Press.

Chicago Style (17th ed.) Citation

Hart. The Fourth Power: A Grand Strategy for the United States in the Twenty-first Century. New York: Oxford University Press, 2004.

MLA (8th ed.) Citation

Hart. The Fourth Power: A Grand Strategy for the United States in the Twenty-first Century. Oxford University Press, 2004.