Dyfyniad APA

(1994). An outline of American history. New York: United States Information Agency.

Dyfyniad Arddull Chicago

An Outline of American History. New York: United States Information Agency, 1994.

Dyfyniad MLA

An Outline of American History. New York: United States Information Agency, 1994.

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