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Dyfyniad Arddull ChicagoSmith, Paul 1.Slee. Think Tanks and Problem Solving. London: Business Books, 1971.
Dyfyniad MLASmith, Paul 1.Slee. Think Tanks and Problem Solving. Business Books, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.