Παραπομπή σε μορφή APA (7η εκδ.)

Kupchan, C. (2003). The end of the American era: U.S. foreign policy and the geopolitics of the twenty-first century. Vintage Books.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Kupchan, Charles. The End of the American Era: U.S. Foreign Policy and the Geopolitics of the Twenty-first Century. New York: Vintage Books, 2003.

Παραπομπή σε μορφή MLA (9th εκδ.)

Kupchan, Charles. The End of the American Era: U.S. Foreign Policy and the Geopolitics of the Twenty-first Century. Vintage Books, 2003.