APA (7th ed.) Zitazioa

Lenz, L. (2008). Power and policy: America's first steps to superpower, 1889-1922. Algora Pub..

Chicago Style (17th ed.) Zitazioa

Lenz, Lawrence. Power and Policy: America's First Steps to Superpower, 1889-1922. New York: Algora Pub., 2008.

MLA (9th ed.) Zitazioa

Lenz, Lawrence. Power and Policy: America's First Steps to Superpower, 1889-1922. Algora Pub., 2008.