APA (7th ed.) Citation

Held, D., & Koenig-Archibugi, M. (2004). American power in the 21st century. Polity.

Chicago Style (17th ed.) Citation

Held, David, and Mathias Koenig-Archibugi. American Power in the 21st Century. Cambridge, England: Polity, 2004.

MLA (9th ed.) Citation

Held, David, and Mathias Koenig-Archibugi. American Power in the 21st Century. Polity, 2004.