Dyfyniad APA

(2010). U.S.A. history in brief. U.S.A: U.S. Department of State.

Dyfyniad Arddull Chicago

U.S.A. History in Brief. U.S.A: U.S. Department of State, 2010.

Dyfyniad MLA

U.S.A. History in Brief. U.S.A: U.S. Department of State, 2010.

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