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Home Omdenken Omdenken met Henry David Thoreau
Omdenken met Henry David Thoreau

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Many men go fishing all of their lives without knowing that it is not fish they are after.

Henry David Thoreau

Laatst aangepast op maandag, 05 juni 2017 13:43  

Concentration is the key to economic results. No other principles of effectiveness is violated as constantly today as the basic principle of concentration

Peter Drucker

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Seminal Works in Educational Psychology and What They Mean in Practice
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