Zeitz, P. (1999). The art and craft of problem solving. New York: John Wiley & Sons.
Παραπομπή Chicago StyleZeitz, Paul. The Art and Craft of Problem Solving. New York: John Wiley & Sons, 1999.
Παραπομπή MLAZeitz, Paul. The Art and Craft of Problem Solving. New York: John Wiley & Sons, 1999.
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