Blum, Robert
McGraw-Hill, 1966
Buku Teks
Fairbank, John K. (John King), author
Harvard University Press, 1967
Buku Teks
Stebbins, Richard P., author
Harper & Row, 1963
Buku Teks
edited by Allan Nevins and Louis M. Hacker
D.C. Heath, 1943
Buku Teks
American Enterprise Institute for Public Policy Research, 1977
Buku Teks