Citazione Stile APA (7a Edizione)
Hart, G. (2004). The fourth power: A grand strategy for the United States in the twenty-first century. Oxford University Press.
Citazione stile Chigago Style (17a edizione)
Hart, Gary. The Fourth Power: A Grand Strategy for the United States in the Twenty-first Century. New York: Oxford University Press, 2004.
Citatione MLA (9a ed.)
Hart, Gary. The Fourth Power: A Grand Strategy for the United States in the Twenty-first Century. Oxford University Press, 2004.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.