Krooss, Herman Edward, 1912-1975, author
Prentice-Hall, 1955
Buku Teks
U.S. Information Service,, 1981
Buku Teks
Graber, Mark A., author
Oxford University Press, 2015
Buku Teks
Fisher, Louis, author
McGraw-Hill, 1988
Buku Teks
Hird, John A., author
Wadsworth , 2004
Buku Teks