APA (7th ed.) Zitazioa
Hart, G. (2004). The fourth power: A grand strategy for the United States in the twenty-first century. Oxford University Press.
Chicago Style (17th ed.) Zitazioa
Hart, Gary. The Fourth Power: A Grand Strategy for the United States in the Twenty-first Century. New York: Oxford University Press, 2004.
MLA (9th ed.) Zitazioa
Hart, Gary. The Fourth Power: A Grand Strategy for the United States in the Twenty-first Century. Oxford University Press, 2004.
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