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Dyfyniad Arddull ChicagoTurnbull, L., M. Rees, and D. Purves. Why Equalising Trade-offs Aren't Always Neutral. 2008.
Dyfyniad MLATurnbull, L., et al. Why Equalising Trade-offs Aren't Always Neutral. 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.