United States Information Agency. (1999). Information USA [computer file]. United States Information Agency.
Cita Chicago (17th ed.)United States Information Agency. Information USA [computer File]. s.l: United States Information Agency, 1999.
Cita MLA (9th ed.)United States Information Agency. Information USA [computer File]. United States Information Agency, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.