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Dyfyniad Arddull ChicagoDay, Christopher, Pam Denicolo, and Maureen Pope. Insight into Teachers' Thinking and Practice. Londod: Falmer Press, 1990.
Dyfyniad MLADay, Christopher, et al. Insight into Teachers' Thinking and Practice. Falmer Press, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.