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Dyfyniad Arddull ChicagoRussell,Bertrand. Human Knowledge: Its Scope and Limits. London: Routledge, 2010.
Dyfyniad MLARussell,Bertrand. Human Knowledge: Its Scope and Limits. Routledge, 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.