File:Piagetian operations.jpg
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current | 19:35, 7 March 2012 | 998 × 493 (45 KB) | Tekks | {{Information |Description ={{en|1=Mental operations according to Jean Piaget. Based on information from Ginsburg H., Opper S. (1979). Piaget's Theory of Intellectual Development. Prentice Hall, p. 152}} |Source =English Wikipedia |Author ... |
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