1.
図書 |
edited by Irving E. Sigel, Frank H. Hooper ; with foreword by Bärbel Inhelder
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2.
図書 |
by Millie Almy, with Edward Chittenden and Paula Miller ; foreword by J. Piaget
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3.
図書 |
by John H. Flavell ; with a foreword by Jean Piaget
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