U.S. Information Service,, 1981
Buku Teks
Embassy of the United States of American, [date of publication not identified]
Buku Teks
Office of International Information Programs, 1991
Buku Teks
edited by Nathan Glick
United Sates Information Agency, 1989
Buku Teks
United State Information Agency, 1994
Buku Teks