Meer over Glenn en zijn team op: https://www.ptccoaching.com
Spencer Johnson: Who moved My Cheese: https://en.wikipedia.org/wiki/Who_Moved_My_Cheese%3F
Nassim Nicholas Taleb: Antifragile: https://en.wikipedia.org/wiki/Antifragile_(book)
https://kiesjeattitude.blogspot.com
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