Gaya APA

Kupchan, C. (2002). end of the American era: U.S. foreign policy and the geopolitics of the twenty-first century (1st ed.). New York: A. Knopf.

Gaya MLA

Kupchan, Charles.. "end of the American era: U.S. foreign policy and the geopolitics of the twenty-first century". 1st ed. New York: A. Knopf, 2002. .