APA (7e ed.) Bronvermelding
Hart, G. (2004). The fourth power: A grand strategy for the United States in the twenty-first century. Oxford University Press.
Chicago (17e ed.) Bronvermelding
Hart, Gary. The Fourth Power: A Grand Strategy for the United States in the Twenty-first Century. New York: Oxford University Press, 2004.
MLA (9e ed.) Bronvermelding
Hart, Gary. The Fourth Power: A Grand Strategy for the United States in the Twenty-first Century. Oxford University Press, 2004.
Let op: Deze citaties zijn niet altijd 100% accuraat.