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Dyfyniad Arddull ChicagoH. Ursprung, Baltimore. The Stability of the Differentiated State. New York: Springer-Verlag, 1968.
Dyfyniad MLAH. Ursprung, Baltimore. The Stability of the Differentiated State. Springer-Verlag, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.