United States Information Agency. (1999). Information USA [computer file]. United States Information Agency.
Chicago-referens (17:e uppl.)United States Information Agency. Information USA [computer File]. s.l: United States Information Agency, 1999.
MLA-referens (9:e uppl.)United States Information Agency. Information USA [computer File]. United States Information Agency, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.