Graber, Mark A., author
Oxford University Press, 2015
Buku Teks
Fisher, Louis, author
McGraw-Hill, 1988
Buku Teks
Horwitz, Morton J., author
Harvard University Press, 1977
Buku Teks
Tribe, Laurence H., author
Foundation Press, 1988
Buku Teks
Pritchett, C. Herman, author
McGraw-Hill, 1981
Buku Teks