(2013). Outline of U.S. government. USA: Bureau of International Information Programs.
Dyfyniad Arddull ChicagoOutline of U.S. Government. USA: Bureau of International Information Programs, 2013.
Dyfyniad MLAOutline of U.S. Government. USA: Bureau of International Information Programs, 2013.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.