Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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