United States Department of State, 1991
Buku Teks
Bureau of International Information Programs United States Department of State, 2004
Buku Teks
edited by Kathleen E. Hug
Office of International Infrmation Programs US Department of State, [Date of publication not identified]
Buku Teks
edited by Nathan Glick
United Sates Information Agency, 1989
Buku Teks
Schroeder, Richard C., author
International Communicational Agency, [date of publication not identified]
Buku Teks