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Dyfyniad Arddull ChicagoLarson, Loren C. Problem-solving Through Problems. New York: Springer-Verlag, 1983.
Dyfyniad MLALarson, Loren C. Problem-solving Through Problems. Springer-Verlag, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.