Dyfyniad APA

United States Information Agency. (1999). Information USA [computer file]. United States Information Agency.

Dyfyniad Arddull Chicago

United States Information Agency. Information USA [computer File]. s.l: United States Information Agency, 1999.

Dyfyniad MLA

United States Information Agency. Information USA [computer File]. United States Information Agency, 1999.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.