Frost, J. A. (1968). A History of the United States: The evolution of a free people. Follett Pub. Co..
Chicago-viite (17. p.)Frost, James Arthur. A History of the United States: The Evolution of a Free People. Chicago: Follett Pub. Co., 1968.
MLA-viite (8. p.)Frost, James Arthur. A History of the United States: The Evolution of a Free People. Follett Pub. Co., 1968.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.