Dyfyniad APA

(1990). An outline of American government. United States Information Agency.

Dyfyniad Arddull Chicago

An Outline of American Government. United States Information Agency, 1990.

Dyfyniad MLA

An Outline of American Government. United States Information Agency, 1990.

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