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Dyfyniad Arddull ChicagoFairclough, Graham, Rodney Harrison, John H. Jameson, and John Schofield. The Heritage Reader. London: AUWSF, 2008.
Dyfyniad MLAFairclough, Graham, et al. The Heritage Reader. AUWSF, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.