Riegel, R. E., & Haugh, H. (1953). United States of America: A history. Scribner.
Lua i Stíl Chicago (17ú heag.)Riegel, Robert Edgar, agus Helen Haugh. United States of America: A History. New York: Scribner, 1953.
Lua MLA (8ú heag.)Riegel, Robert Edgar, agus Helen Haugh. United States of America: A History. Scribner, 1953.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.