Schroeder, Richard C., author
International Communicational Agency, [date of publication not identified]
Buku Teks
U.S. Information Service,, 1981
Buku Teks
Embassy of the United States of American, [date of publication not identified]
Buku Teks
Gultom, Samuel, author
Greenwood Press, 1987
Buku Referensi
Office of International Information Programs, 1991
Buku Teks