Lenz, L. (2008). Power and policy: America's first steps to superpower, 1889-1922. Algora Pub..
Lua i Stíl Chicago (17ú heag.)Lenz, Lawrence. Power and Policy: America's First Steps to Superpower, 1889-1922. New York: Algora Pub., 2008.
Lua MLA (9ú heag.)Lenz, Lawrence. Power and Policy: America's First Steps to Superpower, 1889-1922. Algora Pub., 2008.
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