de Bono, E. (1976). Teaching thinking. Penguin.
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Dyfyniad Arddull Chicago
de Bono, Edward. Teaching Thinking. New York: Penguin, 1976.
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Dyfyniad MLA
de Bono, Edward. Teaching Thinking. Penguin, 1976.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.