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Dyfyniad Arddull ChicagoAn Early American Reader. Washington, D.C: United States Department of State, 2005.
Dyfyniad MLAAn Early American Reader. Washington, D.C: United States Department of State, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.