Strukturgenetische Theorien I: Piaget - ppt video online herunterladen
Referentinnen: Evelyn und Sous - ppt video online herunterladen
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File:Valentine et Jean Piaget en 1932 - cropped.jpg - Wikimedia Commons
693142 The more we try to improve our schools, the heavier the teaching task becomes; and the better our teaching methods the more difficult they are to apply. | Jean Piaget quote,