1.
図書 |
herausgegeben von Otto M. Ewert
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2.
図書 |
von Hildegard Hetzer
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3.
図書 |
John H. Flavell ; with a foreword by Jean Piaget
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4.
図書 |
Lotte Schenk-Danzinger
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5.
図書 |
edited by Marshall R. Jones
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6.
図書 |
by Jean Piaget ; with the assistance of seven collaborators ; [transrated by Marjorie Gabain]
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7.
図書 |
edited by Shigeru Watanabe
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8.
図書 |
Horst Nickel
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9.
図書 |
von Heinz Remplein
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10.
図書 |
Jean Piaget, Bärbel Inhelder
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