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Dyfyniad Arddull ChicagoMarki,L, and Wiegandt,R. Radical Theory. Amsterdam: North-Holland, 1985.
Dyfyniad MLAMarki,L, and Wiegandt,R. Radical Theory. North-Holland, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.