Frost, J. A. (1968). A History of the United States: The evolution of a free people. Follett Pub. Co..
Lua i Stíl Chicago (17ú heag.)Frost, James Arthur. A History of the United States: The Evolution of a Free People. Chicago: Follett Pub. Co., 1968.
Lua MLA (8ú heag.)Frost, James Arthur. A History of the United States: The Evolution of a Free People. Follett Pub. Co., 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.