Carkhuff, R. R. (1973). The art of problem solving. Human resource Development Press.
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Dyfyniad Arddull Chicago
Carkhuff, Robert R. The Art of Problem Solving. Massachusetts: Human resource Development Press, 1973.
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Dyfyniad MLA
Carkhuff, Robert R. The Art of Problem Solving. Human resource Development Press, 1973.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.