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Dyfyniad Arddull ChicagoKrantz, Steven G. Techniques of Problem Solving. Providence, R.I.: American Mathematical Society, 1997.
Dyfyniad MLAKrantz, Steven G. Techniques of Problem Solving. American Mathematical Society, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.