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Dyfyniad Arddull ChicagoGohdes, Clarence. Bibliographical Guide to the Study of the Literature of the U. S. A. Durham, N. C.: Duke University Press, 1963.
Dyfyniad MLAGohdes, Clarence. Bibliographical Guide to the Study of the Literature of the U. S. A. Durham, N. C.: Duke University Press, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.