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Dyfyniad Arddull ChicagoSpengler, Oswald. The Decline of the West. London: AUWSF, 1918.
Dyfyniad MLASpengler, Oswald. The Decline of the West. AUWSF, 1918.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.