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Dyfyniad Arddull ChicagoNuffield Foundation. Secondary Science Project. Nuffield Secondary Science: Teacher's Guide. London: Nuffield Foundation, 1970.
Dyfyniad MLANuffield Foundation. Secondary Science Project. Nuffield Secondary Science: Teacher's Guide. Nuffield Foundation, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.