jan
23
2013
If you have nothing to say, say nothing.
Mark Twain
If the only tool you have is a hammer, you tend to see every problem as a nail.
Abraham Maslow
Beïnvloeden van gedrag De nieuwe wetenschap om verandering te leidenJoseph Grenny, Kerry Patterson, David Maxfield, Ron McMillan, Al Switzler
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